This Particle Breaks Time Symmetry

  • Am Vor 4 years

    VeritasiumVeritasium

    Increasing entropy is NOT the only process that's asymmetric in time.
    Check out the book: WeHaveNoIdea.com
    This video was co-written by Daniel Whiteson and Jorge Cham
    You can also check out PhD Comics: phdcomics.com

    Special thanks to Patreon supporters:
    Tony Fadell, Donal Botkin, Michael Krugman, Jeff Straathof, Zach Mueller, Ron Neal, Nathan Hansen, Joshua Abenir

    Support Veritasium on Patreon: ve42.co/patreon

    Original paper on parity violation by the weak force by Lee and Yang:
    www.physics.utah.edu/~belz/phy...

    More on B-meson oscillations and time reversal violation:
    Physics World Article: ve42.co/TimeReversal
    Original paper: arxiv.org/pdf/1410.1742.pdf
    en.wikipedia.org/wiki/B_meson

    Physics consultant: Prof. Stephen Bartlett

    Studio filming by Raquel Nuno

Tom ow
Tom ow

The guy rocking up to the nobel prize ceremony after violating CPT symmetry: Announcer: Congratulations. You've destroyed half of physics. Here's your prize.

Vor year
jeong
jeong

actually , its not about what we like to believe or wt we believed ,its abt wt truth is.. for that breaking the old believes is necessary..

Vor 12 Tage
Zes
Zes

no such thing as prize or congratulx or physicx about it, j idts, cepuxuax, think, do, can think, do any nmw and any s perfect

Vor 2 Monate
Alia Aira
Alia Aira

But if the prize was..... The prize: one dollar

Vor 4 Monate
Morgan
Morgan

@Sailesh Naidu well, why didn't she win? It's terrible that women were treated so unfairly just a few decades ago.

Vor 5 Monate
Sailesh Naidu
Sailesh Naidu

@Cewla tf u on?

Vor 5 Monate
Ozkee
Ozkee

I think Nolan liked this video so much, he made a movie about it.

Vor year
Krishna Maity
Krishna Maity

@Fluffy an example of retained time symmetry 🤣🤣🤣

Vor Monat
Leonardo Romano
Leonardo Romano

@Ozkee also physics

Vor Monat
Zes
Zes

no such thing as like or make or etc

Vor 2 Monate
Ardeshir Razany
Ardeshir Razany

@Fluffy i agree

Vor 7 Monate
Máximo Yáñez
Máximo Yáñez

Tenet?😁

Vor 8 Monate
aawagga
aawagga

"she and a team of low temperature scientists" is that a nerdy way to call them cool?

Vor year
Deez.
Deez.

Hypothermic scientists 🗿

Vor Monat
Kenneth Wendo
Kenneth Wendo

😂😂😂... That's the cold truth!

Vor Monat
Talha Aden
Talha Aden

2:23

Vor Monat
Mitchell Lepore
Mitchell Lepore

In a mirror darkly!!!

Vor Monat
Lee Ljubic
Lee Ljubic

It means the rest of them were slacking off, doing everything slow.

Vor 2 Monate
Nitin Chaudhary
Nitin Chaudhary

Imagine two people playing chess and the one observer who is observing that doesn't knows the rules of chess before hand As the game proceeds the observer keeps learning and Now when he sees a pawn walking single step straight way he writes down that pawn walks forward and now when pawn goes diagonaly to attack some other opponent piece. The observer is in surprise thinking that it broke the laws of chess Same applies here Nature is chess player and scientists are observer in this never ending chess game Always discovering new moves - Feynman

Vor 2 years
slapmyfunkybass
slapmyfunkybass

Surely no one would be that stupid, you could work out in about 5 seconds they can move diagonally when taking another piece.

Vor 11 Tage
Thomas Kavanagh
Thomas Kavanagh

Well said

Vor 5 Monate
kosc88
kosc88

The question is how many of the moves we discovered? It might be 1% or 99%, no one knows.

Vor 5 Monate
J Astier
J Astier

This isn’t the exact quote, and I feel it doesn’t capture the idea as well as feynman’s original quote

Vor 8 Monate
Ezra Hadwi
Ezra Hadwi

Some fun fact There is more chess possibilities than the amount of atom in this vast known universe

Vor 9 Monate
Anders Rullestad Eriksen
Anders Rullestad Eriksen

Known ways to break a CP law: - super freeze a particle and add magnetic spin - refuse to "pick up that can, citizen"

Vor 2 years
Tannoy
Tannoy

Top tier comment

Vor 9 Tage
NoriMori
NoriMori

I was literally thinking about "CP Violation" during the entire video, so this comment makes me happy.

Vor 8 Monate
Thoughtful_Cactus
Thoughtful_Cactus

*THROWS CANA ND RUNS*

Vor 10 Monate
Josh Young
Josh Young

@Rohith Balaji *that was a joke, haha, fat chance

Vor year
Rohith Balaji
Rohith Balaji

Maybe Black Mesa, That was a joke, Fat-chance, haha.

Vor year
KirbyMobile
KirbyMobile

This really makes me want to find an example that breaks CPT symmetry to see the entire science world implode. That would be funny *laughs in super villian*

Vor year
prateek sharma
prateek sharma

It won't really break any laws it would just mean that the same laws would have to be written again with considering the fact that cpt symmetry is not a thing which a lot of physist assumed back in the day while making these laws like Einstein. The symmetry only makes physics easier that's why it will be a hell a lot of work to complete all the theories of the past for unsymmetrical systems.

Vor 2 Monate
Brian Abraham
Brian Abraham

A truther truth 😂👍🏻

Vor 8 Monate
Decivillain
Decivillain

@Libor Tinka It’s probably better that we keep picking the lowest fruit, rather than pick the higher fruit and have no idea where the others are.

Vor 11 Monate
Libor Tinka
Libor Tinka

@captaine flow chapka reminds me of the faster-than-light neutrinos "discovery" few years ago ... there were lots of interesting debates until they found it was just the systematic error it looks like all the low hanging fruit were already taken in physics

Vor 11 Monate
captaine flow chapka
captaine flow chapka

i mean every single scientist will be thankfull to you to have shown a path to a truther truth

Vor year
Purple Niche
Purple Niche

Salute to those people who don't understand a single thing here but still come back for every veritasium video

Vor year
hyGreen
hyGreen

@Gage McMahon well he has a phd in physics so he definitely knows more stuff than some people

Vor 2 Monate
My Email
My Email

😂😂😂😂😂😂😂

Vor 10 Monate
TILEN FABE
TILEN FABE

It's much more interesting when you understand it. If you don't, use the internet to find out anything you didn't understand as you watch it. I strongly recommend that.

Vor year
SloppyDog
SloppyDog

Yay! Here we are!

Vor year
Jatin Bangar
Jatin Bangar

@Gage McMahon Just type latest standard model of particle physics. You'll understand this video with ease 💯

Vor year
Ryan润安 Wong
Ryan润安 Wong

Fun fact: If Veritasium was an actually recognized element of the periodic table, it would be the 21st element, after Calcium and before Scandium.

Vor 11 Monate
Angeline Philo
Angeline Philo

@UtsGotNoGutsツ that's true but i was trying to think of the logic behind the original comment actually it may be that veritasium has an atomic number of i (imaginary unit) and mass number of 42.0

Vor 3 Monate
UtsGotNoGutsツ
UtsGotNoGutsツ

@Angeline Philo wait... the modern periodic table isnt based on mass number but atomic number.

Vor 3 Monate
Handsome Thanos •
Handsome Thanos •

@Angeline Philo oh! Thanks. I always thought that 42 was the atomic number.

Vor 6 Monate
Angeline Philo
Angeline Philo

@Handsome Thanos • it has a mass number of 42, which is between those of calcium and scandium :)

Vor 8 Monate
Handsome Thanos •
Handsome Thanos •

Why? I didn't understand.

Vor 8 Monate
whiz 85
whiz 85

Low temperature scientists? Those guys sound pretty cool.

Vor 4 years
The COVID-19 Coronavirus
The COVID-19 Coronavirus

I was gonna say that’s pretty chill

Vor 2 Monate
Joel Conceicao
Joel Conceicao

they must be pretty "cool" then🤧

Vor 4 Monate
cubo embaralhado
cubo embaralhado

That is the joke he wanted to do, actually

Vor 8 Monate
janki prasad soni
janki prasad soni

Cool guys

Vor 11 Monate
Mac Kinnon
Mac Kinnon

I'd recognise Jorge Chan's sciency art style anywhere! Though it wasn't until I saw "We Have No Idea" that it was confirmed for me hahaha. I love the science collaboration between my favourite physicists and engineers, and how much easier it can be to learn about as a result. Thank you for this brilliant video - and go check out Daniel & Jorge explain the universe for some fantastic discussions on CP-Violations and more 😁

Vor year
S M
S M

Also I wanted to say thank you for making these videos I really do enjoy them. You are awesome! I am blind so I can't see the graphics unfortunately but your explanations are very nice and I love doing math in my head so it's enjoyable to see you theorize in my head about all the things that you explain

Vor 11 Monate
Adrian Kos
Adrian Kos

If anyone could explain the correlation between disproving CPT and how it would affect our beliefs on special relativity, that would be well apriciated.

Vor 8 Monate
V1ND1E
V1ND1E

All conservation laws depend on symmetries. For example in special relativity, the reason why an object with no resultant force acting on it has a constant velocity, is because the universe shouldn't care about where we set the origin of the 4D coordinate grid (metric) we use to map the objects motion (Lorentz invariance), and as such nothing should change - the conservation of (four) momentum depends on this being true. Since the frame of reference we choose to define as absolute rest (for say an experiment) is arbitrary, the laws of physics (the equations we use) must be invariant under changes in the velocity of our reference frame. Thus your 4D velocity is constant (c). So special relativity depends on CPT symmetry for its axioms to be valid (so that there is a way to reverse time and the laws of physics upholding). It also turns out that quantum mechanics depends on this being true for bosons and fermions to be distinguished, but at a fundamental level CPT violation would destroy basic assumptions like that the universe doesn't care about which charges are positive and negative - which if true means that charge is not fundamental, or even that the assumption that forces are definable by symmetries is not valid (which basically all physical theories assume).

Vor 3 Monate
Schrödinger rocks
Schrödinger rocks

All fundamental physics have conditions that time , charge is symmetric throughout universe

Vor 4 Monate
Darian Leyer
Darian Leyer

In order to test CPT for violations, I would first suggest testing CT and PT symmetries.

Vor year
Wrod of Dog
Wrod of Dog

"The parity's over, guys." That nerdy dad joke made me laugh way harder than it should have.

Vor 3 years
o⩌o
o⩌o

jessie, you broke the parity rule?!?!?

Vor 11 Monate
Liebesleid
Liebesleid

@Amare McDonald mah boy, 2 years later xD

Vor year
Amare McDonald
Amare McDonald

@Liebesleid same lmao

Vor year
Void & Null
Void & Null

Parity is over party

Vor year
J Espinola
J Espinola

From a theoretical perspective, how do we know time only moves forward? If time were to pause, or reverse momentarily or even forever, we wouldn't know.

Vor 10 Monate
Chaos Joerg
Chaos Joerg

I think you have the wrong idea of time. Time is local to begin with. So its progression is happening in the same way as a computer is processing data. If there is a lot of data, it's slower. If there is little data, it is faster, but it can always only go so and so fast. But from out perspective of course we can only see this while the universe is updating the data about us. It would be more correct to say that our realitiy is of such a type where we pecieve time as moving forward. Therefore it can't move backwards because that would contradict how we percieve time.

Vor Monat
Minecrafting_il #DislikeRebellion
Minecrafting_il #DislikeRebellion

that is the time symmetry. saying we cannot know if time is moving forwards or backwards because everything will look the same. if it is broken, that means that we will be able to differentiate time moving forwards or backwards. because it is broken with the experiment shown in the video, we can know if time is moving forwards or backwards, and know when it changes. It is arbitrary which direction we define as forwards and which backwards. However, once we define we can know which direction time is flowing. For example, if we say the current direction is forwards, we WILL know when time reverses, which is what brakes time symmetry (it proves time symmetry's definition wrong).

Vor Monat
Nathaniel Clay
Nathaniel Clay

Really quick question. I'm an undergrad studying chemistry, but would chirality also be used to determine if we're in the mirror world?

Vor year
Orion Gurtner
Orion Gurtner

@Minecrafting_il #DislikeRebellion I definitely agree, I just like talking about it, it’s truly fascinating when you get down to how that affects the quantum ‘bits’ of reality, but it is largely a null question Granted, some scientists (I forget The Who and where) might have found that inverted universe, so it might _not_ be that null of a question, who knows? I really hope that we (our universe and the other universe) get to look at each other’s universe, cause that would be wild for both sides of the proverbial coin

Vor Monat
Minecrafting_il #DislikeRebellion
Minecrafting_il #DislikeRebellion

@Orion Gurtner yes. My point was that it is kinda worthless arguing about what universe is "correct" or if there even is one, because veritasium used those terms for an easier explanation. Let's agree that we are on the same side?

Vor Monat
Minecrafting_il #DislikeRebellion
Minecrafting_il #DislikeRebellion

@Orion Gurtner true, but Veritasium called the right handedness universe the "real" one because it is the real one for us and so calling them left or right handed would just confuse a lot of people for no real gain. So while your comment is technically correct, I think it is unnecessary and irrelevant for this comment (I don't mean to insult you but I couldn't phrase it differently while keeping the meaning). if you disagree, I would LOVE to talk about this more as I find this concept fascinating.

Vor Monat
Orion Gurtner
Orion Gurtner

Theoretical physics researcher here: there would be virtually no way to determine which universe is the ‘mirror’ universe due more to one’s own concept of a ‘real universe’ than any rules Basically: even if there were experiments one could perform to determine the ‘left hand’ universe from the ‘right hand’ universe (and there sort of are), it would still be your own universe that’s real to you, and mirrorverse you will feel the same about their own reality Because you’re a part of your own very real, very existent universe, left or right handedness means little to what realness means for an observer

Vor 3 Monate
Anton Nym
Anton Nym

CPT just means I have a good excuse for being late to any event. [that was a joke!] Good video! Hey, if I understand it this well, then you did an awesome job explaining it. Thank you!

Vor year
Mr. Winter
Mr. Winter

Though I don't know much about them compared to what there is to know, I love quantum field theory as well as special relativity. This means that the possibility that both of them are wrog because CPT "breaks" (if you can put it that way) has become one of my greatest fears.

Vor year
Oliver Broad
Oliver Broad

Also great explanation of what breaking time symetry looks like.

Vor 11 Monate
S M
S M

It would be very interesting to have CPT broken require a lot of rethinking a fundamental laws of physics. I think it would be fun a whole world of discovery and begin again

Vor 11 Monate
saeed ahmadvand
saeed ahmadvand

First, I should thank you for your awesome videos! With all due respect, this time symmetry is related to the evolution of a physical system, which is different from arrow of time dictated by the second law.

Vor 2 years
saeed ahmadvand
saeed ahmadvand

Sorry, I think evolution time is the one rising from the second law.

Vor 2 years
Konoz Rashid
Konoz Rashid

I must say Derek that, I'm really inspired by all of your research and, as a true fan of physics since the age of 15, I would say, what if you and me together break the last remaining symmetry?😅 Anyways, another brilliant video.

Vor year
Vivaan Parashar
Vivaan Parashar

Hey @Veritasium! love your videos, I just wanted to ask, which software do you use for these amazing animations?

Vor year
jon Sqze
jon Sqze

Thank you for all of this. You are inspiring me, and I'm sure millions of other. For that I truly thank you.

Vor year
Serge Theijs
Serge Theijs

You are amazed by breaking time symmetry while I am still trying to wrap my head around how on earth they can measure the movement of quarks while they are still inside an atom, like HOW??? Who does these measurements, how can you see, follow and exactly measure subatomic particles still formed as an atom moving at the speed of light...mind blown. You should make a video where you explain the processes of HOW THE HELL THEY DO THIS? Like how does CERN work, how can they see collisions?, what does that look like? What can they see in those pictures they always show us of particles flying in every direction? how do you derive, spin, speed, mass and momentum? To me they look like fireworks but to them it tells them how the universe works on a quantum level. What do they see? How do they see it? I know how a multimeter works, I know how an oscilloscope works...but this woosh right over my head, could you make a video or a series of video's that goes in to depth and explains in laymens terms?

Vor 10 Monate
DECEO 21
DECEO 21

This is one of my favourite videos ever. I first saw it a few years ago and it still baffles me.

Vor 2 years
sohini basu
sohini basu

Excellent video. The way you explain such difficult things in such a cool way is really commendable. 👍👍👍

Vor 9 Monate
J.S. Ward
J.S. Ward

Mentions Inception in video. Three years later: TENET

Vor year
Alia Aira
Alia Aira

@Kittycraft0 Yeah what's TENET?

Vor 3 Monate
DJ A.
DJ A.

U mean “Three years EARLIER”

Vor 9 Monate
James Targin
James Targin

That movie was weird as hell

Vor 10 Monate
Ad Uts
Ad Uts

@Jonathan Berry no,it will be in 1 year in the past

Vor year
Jonathan Berry
Jonathan Berry

@Ad Uts It came out quite a long time before your comment.

Vor year
Yuganka Sharan
Yuganka Sharan

There are many processes where particles come out in all kinds of directions. I am unable to understand why the directions in which they come out could not simply be due to their physical configuration, and have nothing to do with parity as such.

Vor 26 Tage
FrySauce
FrySauce

I love little more then when scientists say that something is nonsense and then are immediately proven wrong when they try it themselves

Vor 7 Monate
kabenitezguy
kabenitezguy

I love watching videos like these and pretending to know exactly what hes saying. "What?! The weak force?! CP? Preposterous!"

Vor 3 years
Halit Ozgur
Halit Ozgur

@Evan Greene 2nd like 👍

Vor 3 Monate
Mika Schmidt
Mika Schmidt

@Hel Trom good intentions dont mean good actions lol -Albert Einstein

Vor 11 Monate
Mika Schmidt
Mika Schmidt

@Kyle you're not a know it all, so therefore, no u. -Sun Tzu, the art of war

Vor 11 Monate
The Wizard
The Wizard

@Software Livre read his comment again and read mine Again.

Vor 11 Monate
Zack Horton
Zack Horton

Oh. Hey. I am Kyle. I don't remember making that comment. But yeah, I had good intentions. i am from phillipines

Vor 11 Monate
Shreesha KR
Shreesha KR

Sir you are very brilliant! I am extremely motivated by you and I want to become like you 👍🏾🙏

Vor 11 Monate
Pablo Cardona
Pablo Cardona

How does this man manages to make every single topic so interesting and enjoyable in each video?

Vor 8 Monate
Jeremiah Leit
Jeremiah Leit

I read a segment in an optics book that had some of the work of Feynmann and it showed that if a particle begins to travel backward in time the charge reverses and it becomes an antiparticle. An electron traveling backward in time is a positron. Photons having no charge appear to travel backward in time when they are violating the light-speed limit. These are called tachyon gamma rays.

Vor 2 years
Teal Golem- Gaming Anime Reviews, Games, and More
Teal Golem- Gaming Anime Reviews, Games, and More

I could totally see the person discovering CPT symmetry breaking keeping it a secret as to not just destroy physics

Vor 3 Monate
Paulo Roberto Machado Duarte
Paulo Roberto Machado Duarte

I thought entropy was also symmetric in time, i mean, it’s not impossible to have a decrease in entropy but very very very very very unlikely. Hence, if you put a system in a perfect state, theoretically you should be able to watch a spontaneously reduce in entropy

Vor 4 Monate
ATOMSK
ATOMSK

It is a very interesting phenomenon... I like to think it's just a normal part of the way things balance out.

Vor year
Elmer Landaverde
Elmer Landaverde

It’s crazy that Chien-Shiung Wu didn’t receive the Nobel price for her work!!

Vor year
kwgm
kwgm

@Ink Bold You haven't thought this through. Regardless of whether or not Mrs. Wu deserved the 1957 Nobel Prize in physics, each year the winners of the most prestigious prize in the physical sciences are decided by a committee drawn from members of the Royal Swedish Academy of Sciences. Why would American "racism" have had anything to do with that year's selection?

Vor 8 Monate
Shashwat Sharma
Shashwat Sharma

@Josh Young I thought they didn't, using it as an excuse to not give Gandhi one

Vor 10 Monate
Theophania Lily
Theophania Lily

And kind of disappointing the way he twisted around saying so.

Vor 10 Monate
Josh Young
Josh Young

@Kingp1n81 not really sure what being scared has to do with it, but they sure were dismissive

Vor year
Cameron Chapman
Cameron Chapman

hey, i know this is an old video but i have a question for you. ive been looking into the time symmetry one and i cant find any research on the up quark and down quark pair without a 3rd quark. the closest i found was a meson but i soon learned that is a quark and antiquark, not up and down. can you provide more details on that along with the two "arrangements" you mentioned? i want to understand why time symmetry is broken. i understand that up quarks have a charge of +2/3 relative to a proton and a down quark is -1/3 but what are the two arrangements? how do you know what arrangement they are in? what is the "position" of them relative to? as far as i can tell of they were rotated or something they would be indistinguishable from eachother unless the shift was relative to something constant such as the nuclear spin. if there is no way to look at it and say 100% that it is in position "a" or "b" then wouldnt the switch just repeat long time short time? imagine a dot is a short time to switch and a dash is a long time to switch. .-.-.-.-.-.-.-.- is indistinguishable to -.-.-.-.-.-.-.-.-. unless you can see the beginning and end which we cannot see in the real world, or you have a way to name the positions of the particles definitively. i would really really love a response i am having a really hard time understanding. if anyone else has the same question please like this so it gets to the top where more people will see it. if you can answer the question please do. thank you in advance

Vor year
MikeRosoftJH
MikeRosoftJH

Well, imagine the force of gravity or electromagnetism. The gravitational force between two massive objects, or electric force between two charged objects, decreases with the square of distance: F=C/r^2. (You can imagine that the net amount of force is constant, but as the distance increases, it is spread over a larger area - a surface of a sphere with an increasing radius.) So over sufficiently long distances the force between two two objects is negligible. Strong force works differently: even over very long distances, two particles with a color charge experience a large attractive force. We can write it as follows: F=C/r^2+D. This is why any particles that we observe must be color-neutral. Imagine a color-neutral particle, like a proton, which consists of three quarks (each carrying a color charge). Now suppose that some force would try to move one of the quarks away from the proton. The force formula tells us that even over very long distances the quarks would experience a large attractive force; this also means that as the distance increases, the system's energy increases beyond any bounds. At some point, it would increase so much that it would form a quark-antiquark pair; these quarks and anti-quarks would then re-combine into color-neutral particles. (This is what we observe in high-energy particle collisions - we don't see free quarks, we only see jets of color-neutral particles.) Now imagine that you had two particles, both having a net color charge - say, a centimeter apart. It can be seen that the amount of energy this system would have is huge, and it would immediately decay into a shower of particle-antiparticle pairs. And that's precisely why any free particle needs to be color-neutral. And that's also why you can't have a particle consisting of two quarks - there's no way to combine two color charges to make a color-neutral particle. (Quarks have three different color charges: "red", "green", and "blue", which combine into a color-neutral state - just like a positive and a negative electric charge combine together into an electrically neutral object. Anti-quarks, then, have opposite charges: "anti-red", "anti-green", and "anti-blue"; red and anti-red can also combine into a color-neutral particle.) You can have a baryon (three quarks), or a meson (quark and anti-quark), or various exotic and unstable combinations such as a tetraquark (two quark-antiquark pairs) or a pentaquark (three quarks, plus a quark-antiquark pair). All these combinations check out to a color-neutral particle. The quark names - "up" and "down" - have nothing to do with directions; they're just names. (Likewise, color charge has nothing to do with actual colors of visible light; it's just an analogy for how the charges combine.) For completeness, the other kinds (or "flavors") of quarks are "strange", "charmed", "top", and "bottom" (the last two are also sometimes called "truth" and "beauty").

Vor year
Cameron Chapman
Cameron Chapman

im not sure why a lot of lines have a line through them. on my screen a lot of the words i typed are crossed out. if there are missing words on your screen please let me know so i can fill in the blanks.

Vor year
Олег Козлов
Олег Козлов

- Honey, are you ready for a vacation? -Sorry, dear, I have some fundamental physics principles to topple!

Vor 4 years
Tanner Summerville
Tanner Summerville

Vacay in Sweden. Two birds, one stone.

Vor year
Ajax
Ajax

@Rahim Asif I know, I was just referencing a HL2 quote lol

Vor year
Rahim Asif
Rahim Asif

@Ajax He's referencing Schrodinger's Cat Experiment

Vor year
Ajax
Ajax

@Manjoume Thunder What cat?

Vor year
Manjoume Thunder
Manjoume Thunder

Again? Remember the last time you tried doing that? I think the cat still has nightmares from being stuck in that box.

Vor 2 years
Hello Kitty Fan Man!
Hello Kitty Fan Man!

What technology would they have had to measure for this parity experiment back in the '50s?

Vor year
Ash Roskell
Ash Roskell

I have that audiobook, We Have No Idea. It’s really entertaining, groaningly funny, and deeply fascinating. It really does explain clever, complex ideas in a manner that anyone can understand.

Vor year
YeYaTeTeTe
YeYaTeTeTe

Pauli: That's nonsense! Wu: Yes, but also true.

Vor year
nah
nah

GP: "how can that be?"... M2: "I don't know man, I didn't do it"

Vor 11 Monate
Rod Schmidt
Rod Schmidt

According to Einstein, one man's space is another man's time -- so where it says "time" in this video, it will also be "space" in some other reference frame (=state of motion). So we could equally well call it a CPS symmetry According to Feynman, a double reversal in space is equivalent to a double reversal in time, which is equivalent to a particle swap, which is equivalent to a 360 rotation, which is NOT equivalent to doing nothing! Instead, a 720 degree rotation is equivalent to doing nothing. (I'm not sure how that's relevant, but I'm pretty sure it is) So, since time in one frame is space in another frame, a faster process in one direction than the other is, viewed in the other frame, ... what, that's not the same left-to-right as it is right-to-left?

Vor 2 years
An_Annoying_Cat
An_Annoying_Cat

“The laws of physics shouldn’t care. They should work exactly the same in the mirror world as they do in real life.” Illuso: *laughs*

Vor 2 years
Troy Taylor
Troy Taylor

jojo referemce

Vor 8 Monate
G-Smith
G-Smith

Your post just made me realize that law of physics working differently in the mirror world sound like a good idea for ANY movie haha

Vor year
Debbie Chan
Debbie Chan

I‘m just happy that you mentioned Prof. Chien-Shiung Wu, one of the physicists I truly admire

Vor 11 Monate
Verschlungen
Verschlungen

At 3:00-3:03 we hear this: "In the mirror, the direction of the z-axis is flipped, but the direction of nuclear spin is NOT." Actually, what Whiteson and Cham show us is just one of three ways that such an illustration can be be set up. In the other two ways, the direction of the nuclear spin WOULD be flipped in the mirror. (Granted, this is how 'everyone' always presents these Wu experiment cartoons, implicitly choosing just one of the three possible starting orientations, then proceeding as if it were the only possible starting orientation. No doubt they took this approach to avoid an overly long video, but still it needs to be pointed out.) Second point: All such mirror-cartoons actually tell us nothing about the Wu experiment itself, whose results are very straightforward (never mind how fabulously complex its design and implementation were). The mirror-cartoons silently change the subject to: WHY-the-experiment-was-important, away from WHAT-the-experiment-was.

Vor 10 Monate
Trinanjan Dey
Trinanjan Dey

I appreciate you for sharing your knowledge

Vor 8 Monate
Abhijit Desai
Abhijit Desai

Increasing entropy and arrow of time, both look to be a result of consistent (in scale) and continuous breaking of symmetry by subatomic particles.

Vor 2 years
Gareth Dean
Gareth Dean

"Hey, so, ready for that vacation?" "I can't, the weak force may violate p-symmetry." "Then there's only one thing we can do!" "Stare at cold metal atoms!" -A physic(s)al relationship.

Vor 4 years
DANG JOS
DANG JOS

*The Veritasium in these comments is fake! Do NOT click on the potentially dangerous links!*

Vor 4 years
aaay aaay
aaay aaay

Stop!

Vor 4 years
Feynstein 100
Feynstein 100

+Vampyricon Lmao I guess

Vor 4 years
Vampyricon
Vampyricon

The PBS Spacetime comment squad

Vor 4 years
Bernd Eckenfels
Bernd Eckenfels

Can you reverse radioactive decay? Especially with the halftime it seems time bound.

Vor 8 Monate
Ryan Larose
Ryan Larose

This could mean that we could encounter an alien race that lives backwards from us. You're born when you die and die when you're born. Interesting concept for sci-fi at least.

Vor Monat
John -
John -

I feel like the part around the time symmetry violation could have been better explained. After watching the video, it seemed as if violating one of the "sub-symmetries" should lead to the collective CPT being violated, but then the video seemed to conclude that it might still hold, but that we should doubt it even though violations have been proven in each "sub-symmetry".

Vor year
morfanaion
morfanaion

Question, how can we know that time travels in only 1 direction. In a 4D space where our location is determined in XYZT, the function of our lives is heavily dependent on time. As such, if time were to travel backwards, we would travel backwards. We ourselves would however not be able to pick up on this, because our memory of the future would disappear, as on that XYZT location, it is not a part of our life, not a part of our memory...

Vor 7 Monate
Ajeet
Ajeet

Second law entropy states that entropy of isolated system is always increase

Vor 6 Monate
Derek Wright
Derek Wright

How much could time asymmetry contribute to the "one way speed of light?"

Vor 10 Monate
Amogh {Infallible}
Amogh {Infallible}

Sir! I think that the direction of rotation (spin) of the (Co)60 element should also get reversed into the mirror dimension don't you think so... {Determined time in the video (>3:13>) Because direction of spin is just a matter of perspective e.g., "as if you are noting the direction of spin from a particular direction and again from the direction opposite to the particular direction the direction of spin should get reversed" So, if the frame of reference in the non-mirror dimension is along the +ve Z-AXIS, Into the mirror dimension it should also be along the +ve Z-AXIS and if the direction of spin is noted clockwise in the non-mirror dimension then into the mirror dimension it should get reversed to anticlockwise into the mirror dimension. .....As per my opinion! . . . Plz concern me mailing or replying....

Vor 2 Monate
YohanKam
YohanKam

Amazing video ,it was so different for everything I've seen before

Vor 8 Monate
Paul Coceancig
Paul Coceancig

So when a particle decays... are the way the sub-particles are separating defined by the spin of the original particle? How does decay work... or what is the drive that causes decay? Why do half lives differ? How do all particles know what all other particles are doing in order to predictably define a half life?

Vor year
Rob
Rob

I've been binge-watching Derek's amazing videos... and I gotta say, in this one, he looks realllly baked ...but it's okay, he's Canadian and Californian, so its allowed either way (plus I'm sure it was for science anyway) 😉

Vor 2 years
Caleb Huston
Caleb Huston

I’m watching this video at about 1:45 AM, 4inches from my face and found that when I look at the top-middle particle at 2:30 the top left particle is in my left-eye’s blindspot. Also my right eye is closed. Phenomenal.

Vor year
kcwflare
kcwflare

every particle has its own verry small hravity so the entropy theory can be partially proven wrong however all other forces pull away except bonding forces.

Vor 2 years
Arval VE
Arval VE

I really don't get 3:10, as to how the object rotating in the mirror would still be going clockwise, I mean, The axial direction of rotation, is usually given by the right hand rule, so going by that, the Co in the real world, rotated in an axis going into the mirror. But when we switch to the mirror world, we have to switch perspectives too, so looking from the mirror version of you, and using the 'right hand' of the mirror you, that is, the left hand of the real you, the mirror Co, spins again in an axis going through the mirror.

Vor 2 years
The Mystery Pickle
The Mystery Pickle

Somehow this video gave me a better understanding of spins in a shorter time than some other videos that are entirely about spins.

Vor year
Grace Marotta
Grace Marotta

I love the way your brain works you make it so underable.

Vor 6 Monate
gioni frisca
gioni frisca

So what if it takes a little "more" time to go back in the same state? That doesn't break time symmetry. It would if it didn't go back at all. Quantum defines TIME, not our macroscopic 3d mirror/tape/line. So we correlated spin of Co with (the direction of emission of) an electron.

Vor 2 years
にゃあエイリアンMeowAlien
にゃあエイリアンMeowAlien

I don't understand half of it but cool video man! 👍

Vor 4 years
Who-man who
Who-man who

It's just about mirrored images I believe it was because the exiting particles that went it's mirrored image was on the same axis as the spinning object which being mirrored would mean being not seen because it's traveling away on the same axis as the object spinning just like if I'm larger than a person or thing behind me in a mirror it would not be seen in the mirror if it held the exact plane out of site in the mirror it wouldn't exist but it does exist the same thing as what's his name's car in a box it's both dead and alive until it's visible that applies here

Vor 3 years
Melpheos1er
Melpheos1er

It's ok, i understand the other half so we can merge our understanding and become rocket engineers :)

Vor 4 years
Rubab Huss
Rubab Huss

I was just about to comment that I don't understand 90% of this video. I think I need some kind of degree in physics to understand what this video was about.

Vor 4 years
にゃあエイリアンMeowAlien
にゃあエイリアンMeowAlien

アハメド サミ lol really?

Vor 4 years
Rafi Ahmed
Rafi Ahmed

MeowAlien にゃあエイリアン, You are everywhere.

Vor 4 years
brainseason
brainseason

Relevant to a mirrored universe as was mentioned, the principle of relativity allows that there is no absolute frame of reference. In consequence, light moving relative to any frame of reference observable from any relativistic object in any state of motion in 3 dimensional space will not change its velocity relative to that object ( Remaining at C in vacuum for the sake of appropriate instance).

Vor 2 years
INFPail
INFPail

Hi veritasium, I doubt you’ll read a comment on such an old video, but while trying to wrap my head around this I had a question about the quark example towards the end. First of all, I’m a physics undergrad, with extremely limited knowledge on this topic. But what I wanted to dig a bit at here was the idea of a “fundamental particle” breaking T. The example given was for a two-quark system, which made me wonder if there are examples of lone elemental particles breaking time symmetry. I know quarks are never found alone, but for any other particles. Also, just a thought: if we discover that time symmetry is a law for only fondamental particles but not systems of particles, we could possibly redefine what we think of as fundamental and non fundamental. I don’t know enough about time dependent wave functions but perhaps time symmetry makes more sense when we use wave models as opposed to particle ones? Anyways, love your content. Always like being able to reevaluate what I know and find topics to dig deeper into.

Vor 7 Monate
Exe Calibur
Exe Calibur

The preferential direction of the particles release from the cobalt is odd in this explanation. 5:32 It shows that the north pole of the atom faces the mirror along the z+ axis, but faces the z- axis in the mirrored world, as indicated by the arrows depicting magnetic alignment. Unless there's more to these diagrams/explanations not shown here, there seems to be more than just parity violations to the laws of physics.

Vor 2 years
DJ Syntic
DJ Syntic

There is a fun thing about symmetry that you can realize with a bit of a thought experiment. Imagine we make contact with an alien race. They aren't on our world and we simply communicate with them through an audio box. When we start off communicating with them we might start off simple, by doing something like sending beeps in a pattern that could be interpreted as intentional and see how they respond. For the same of this thought experiment, we'll say we've been working at it for a while and have managed to share enough about ourselves that we can communicate with language. We have for instance discovered that they are on a planet that also has gravity and so they can understand what we mean by up and down. Their planet also has magnetic poles so we can communicate north and south. Their planet also spins so we can communicate traveling in the same direction as the spin or the reverse direction of the spin, and that we call that going east and west. We through some more complex descriptions could explain our concept of right and left to them. But here is the problem, there doesn't seem to be a way to communicate clockwise or counterclockwise to them. If they are on a planet that spins in the reverse direction of us, our descriptions of our planet would still make sense, but they would, unfortunately, mirror everything. If they drew a picture of what they thought a human looked like based on our description of ourselves, they might equally likely draw the heart on the right or the left side of the drawing. They would just think that the side they drew it on was the left side based on their best understanding of what we could communicate with them. And with these other symmetries talked about in this video, if we weren't even positive the dimension we were communicating with, we would have confusion with these other issues. So the fact that there are ways for particles to break symmetry in some ways but not others is a GREAT thing. Because this means in our communications with this race we could find orientation we have compared to each other. IE: You do this experiment and we'll do the same experiment. If we get the same results we have the same orientation. If we get reverse results we have opposite orientation and just need to keep that in mind for future communications.

Vor 2 years
Stroheim333
Stroheim333

It is hard for me to believe that time has anything to do with the quantum world. In the end we will discover that time is an emergent property of the universe, that the entropic _arrow_ of time _is_ time.

Vor 11 Monate
Reclaimer Studios
Reclaimer Studios

What if we just made the spinning cobalt randomly emit electrons at different times, then, if we played it backwards, it wouldn't be symmetrical.

Vor year
Suthin Scientist
Suthin Scientist

There's some videos you can rewind and the backwards playing may not be obvious, like if to was a pendulum swinging. In that case, the pendulum looks the same forward and backwards. Entropy prevents such temporal symmetry for certain things. For example, if you reverse a video of an egg breaking, it's obvious that it is backwards.

Vor 2 years
Prateek Sridhar
Prateek Sridhar

If CPT symmetry was found out to be false, I dont think Special Relativity and Quantum Field Theory would not be totally destroyed, but some special conditions might be added to them. That being said I don't really know much about them, this is just my imagination.

Vor 2 years
Corkas_
Corkas_

Science doesn't mean its right, it just means its the closest thing we know of to being right at any moment.

Vor 4 years
Michael Martin
Michael Martin

Nothing beats Gödel. He's the real god.

Vor 4 years
Arne
Arne

reality could well be as deep as fractals (but without the repeating rules), with ever more lurking for better measurements, but still our theories allow us to *use* the layers we already understand - use them, for example, to send these messages on youtube. We do not need the existence of an absolute truth to give a reason for improving our theories with ever better measurements. If we can always get better, then we can always get better, and that can keep improving the quality of life. Maybe some day we’ll even reach the point that we understand ourselves well enough to build a stable, global society which benefits all humans.

Vor 4 years
Recap 60min
Recap 60min

Λ R G O N Λ U T Nothing is ever proven true. Only withstands the test of time till proven false.

Vor 4 years
James Speiser
James Speiser

i don't think that assumption is necessarily correct...an atheist could have made that same statement

Vor 4 years
James Speiser
James Speiser

a lot of truth there

Vor 4 years
Steve Hinkle
Steve Hinkle

The weak force violating parity symmetry is totally normal! After all, as with lots of other times, the W and Z bosons, which cause the weak force, are responsible for all sorts of weird phenomena!

Vor 2 years
AlohaBoy
AlohaBoy

You mentioned the Nobel Prize for Proving the “Handedness” of Nature. Yes, that was True. And it’s also True that it was a TOTAL SHAME that “The First Lady of Physics”, Chinen-Shiung Wu was looked over and DID NOT get the Award or recognized! I found it curious that you omitted that part out of your presentation; leaving it vague so your audience would assume that Chinen-Shiung Wu, “of course” got the Nobel Prize, when in fact she didn’t! It’s like another injustice to her to not, at the bare minimum, mention how she was wronged and wasn’t one of the physicists who was Awarded after making such a major discovery.

Vor 2 years
Akash Verma
Akash Verma

okay SJW why dont you go cry about it on twitter, now that said what happend to her might be wrong but there is no point crying about it here

Vor year
AlohaBoy
AlohaBoy

@skubb Heave that’s why I said, who cares anymore. I don’t! But come to think about it, it does seems like the Flat Earthers might actually have a good point about Scientists and the elitism/gatekeeping on Science after all... 🤔

Vor year
Mohammed Ayan Khan
Mohammed Ayan Khan

If anyone reading this, stop replying to this thread. There is literally a war of opinions going on, which isn't any healthy discussion like it was earlier.

Vor year
RYH K
RYH K

@AlohaBoy Why in the hell would she get a Noble Peace Prize? What has she substantially or directly contributed to the cause of humanity? WTF would she even want a Peace Prize for? I've worked for two Peace Prize winning organizations and that fact doesn't even buy me a cup of coffee!

Vor year
Mikkel
Mikkel

That was a really smart way by the simulation software, to be able to synchronize absolute time, when re-running events back and forward, where some part of the universe is computed in different details. Quarks time symmetric violation makes a measuring counter, asymmetrical to keep track of loop directions made independently.

Vor year
Austin Tyler
Austin Tyler

I was wondering who to complain to about the horseshoe magnet animation generating a uniform magnetic field. Glad I found out by the end of the video.

Vor 10 Monate
Paul Huffman
Paul Huffman

Your video covers up the fact that Wu's work did NOT win HER the Nobel Prize, but won it for the two theorists, Lee and Yang.  Her contribution to the discovery was largely overlooked until she was awared the Wolf Prize about 20 years later.

Vor 4 years
Blackberry0Pie
Blackberry0Pie

@a Jojo's comments are removed, so that's probably good. But stop this nonsense of American. Assuming that everyone identifies as an American to not be perceived as racist or bigoted is some pretty stupid semantic gymnastics. The worst part is when the subject is, e.g. a native African that has never left Africa in their life, and then people call them African Americans. Stop this nonsense. Just call them "of descent" unless you know they are actually American. This message has been brought to you by: The Society of People who Think that Names Should Mean Something.

Vor 3 years
a
a

@Jojo Lolo WTF are you talking about, the Chinaman is NOT the issue here, dude! I'm talking about drawing a line in the sand, dude, across this line YOU DO NOT...also, dude, Chinaman is not the prefered nomenclature, Asian American, please...

Vor 3 years
gxlorp
gxlorp

I think it's racist the animator decided to not depict her Asian features because he was scared it was touchy. It's ignoble and based on fear. If he's trying to protect Asian people from being hurt, it's really a rather demeaning attitude. What's meant to protect just makes it seem like you think them weak and can't handle it. Christ

Vor 3 years
Alex Wyler
Alex Wyler

Donald Trump is nominated this year to receive a Nobel Prize...

Vor 3 years
Kaede
Kaede

What if time moves back randomly, but we don't know it because every recording, memory or action is reverted?

Vor 11 Monate
Unauthorized Expression
Unauthorized Expression

When you get this deep into seemingly unobservable phenomenon you will always find chaos because we're living in a simulation run by something like a computer. While that computer may be vastly superior to anything we think of as a computer it is probably not infinitely so, therefore corners must be cut. Why render or "bake" physics into a simulation that will never be observed? Why waste the processor power? Any physicist that doesn't see evidence that we are in fact living in a simulation is a mediocre physicist or just hasn't bothered to really think about the findings of physics. Every physicist should learn how to make video games. It would give them a perspective that would shatter their entire concept of reality.

Vor year
Why Does It Matter
Why Does It Matter

The saddest part about this is, time is just a measurement of movement. So time it's self doesn't exist. Just the recording of the movement. So if the movement is played backwards everything looks normal in physics. But when I add something that doesn't exist in physics, like a measurement of a direction of movement timed. it looks problematic, but in truth it's not.​

Vor year
Kierancraft
Kierancraft

Mojang really needs to fix these parity issues

Vor 7 Monate
GM Web
GM Web

Particles are abstract models of physical phenomena. If experimental results don't fit the model then they usually just invent more particles, even virtual ones, just to keep the models going.

Vor year
Thirteen
Thirteen

It'd be interesting then to see the rework if cpt symmetry is broken since what we do have matches so closely with what we observe

Vor 8 Monate
James Stranger
James Stranger

If the magnetic field is applied in one direction relative to the 'real world', then why wouldn't it be reversed in relation to the 'mirror world'? I obviously know this must not be the case since there were two noble prizes to back this up, but it doesn't make logical sense in my mind.

Vor year
Wolfgang Engler
Wolfgang Engler

Parity violation was actually discovered by Cox and Chase, circa 1928-1930, well before the 1956 Wu experiment. What is stunning in hind-sight, is how the result of male experimentalists Cox and Chase was ignored for almost 30 years; and ignored by everyone, including eventual Nobel laureate theorists Lee and Yang, and female experimentalist Wu who was also overlooked in the Nobel award. As this video shows, Cox and Chase are still going without any credit whatsoever for their iconoclastic discovery.

Vor 2 years
InskayDanork
InskayDanork

We did CPT-Symmetry in theoretical electrodynamics just a week ago, very interesting to have it put into a larger context.

Vor 4 years
Josh Funder
Josh Funder

Wouldn’t time not be violated by those particles that are able to switch at different intervals because they are consistent intervals?

Vor year
edge21str
edge21str

It’s a bit frustrating knowing these theories are incomplete. We can only hope to experience the day when someone discovers something enlightening and develops an accurate theory to explain what we already know and also what we don’t know.

Vor 2 years
Devam Jani
Devam Jani

Some of the best content creators out there

Vor year
Algaroth The Mage
Algaroth The Mage

I don't know why, but the fact that clockwise spinning objects still spin clockwise in a mirror has broke my mind

Vor year
Russell Rozenbaum
Russell Rozenbaum

Wouldn’t the particles in the mirror be spinning counter-clockwise relative to the magnet?

Vor 2 years
Lone Starr
Lone Starr

Don't confuse mirroring for rotation.

Vor 2 years
GamerShy Uncut
GamerShy Uncut

"Time parity cannot be broken" so... a bouncing ball can logically bounce higher with no extra force without outright reversing physics?

Vor 7 Monate
Kyle
Kyle

Does time always move forward? If time froze or even reversed we wouldn't know because we would be affected too.

Vor 3 Monate
Jhon Connor
Jhon Connor

las leyes de la naturaleza siguen ciertas simetrías del espacio y tiempo , se ve que el tiempo va en una dirección por lo tanto no se puede decir que se puede ir hacia adelante o hacia atrás sin problemas porque algunas leyes dependen del tiempo y éste no puede ser simétrico

Vor year
plasmahead2
plasmahead2

I kinda want someone to break CPT just for the chaos it will bring. Chaos is good for innovation and breakthroughs, and I want a lightsaber and tricorder damnit...

Vor 4 years
Ishpreet
Ishpreet

"Some people just want to watch the world burn"

Vor 2 years
that dude
that dude

Thanos???

Vor 2 years
Tauhid
Tauhid

bruh.....AT THIS POINT IMMA QUOTE "vision" "I'm saying there may be a causality. Our very strength invites challenge. Challenge incites conflict. And conflict... breeds catastrophe."

Vor 2 years
Feynstein 100
Feynstein 100

Chaos is a ladder :)

Vor 3 years
obviously matt
obviously matt

Lord Waluigi he’s not an animal (in ‘spirit animal’ context). He’s a person with a similar ideology to yours.

Vor 3 years
sarah grierson
sarah grierson

So some particles violate time symmetry but to my understanding only when they are super cooled ? From my understanding (which is very small haha) heat transfer determines the passing of time ?

Vor year
ffggddss
ffggddss

"Physicists once thought that parity, charge, and time were the symmetries that were unbreakable. But over time, each of these symmetries was demonstrably violated." – Well there's your answer! If you simply reverse time, eventually none of those symmetries is violated!! It's time to start looking into renting a tux and writing my acceptance speech, y'know, for Stockholm . . . Fred

Vor 2 years

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