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The Many Worlds of the Quantum Multiverse | Space Time | PBS Digital Studios

November 17, 2019

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  • Reply John Carroll September 9, 2019 at 5:44 pm

    Can anybody posting here further expound on the theory that the Large Haydron Collider may have caused this for the layman???

  • Reply John Sikes September 10, 2019 at 9:57 pm

    Yeah, I never understood why the cat's unknown current condition meant it was both dead and alive. It's one or the other, folks, whether you open the damned box, or not. The cat is either looking at the inside of the box, or it's beginning to rot in it, one or the other, not both at any given moment, opening the lid doesn't change that. Seeing the outcome just makes it known to YOU, it doesn't somehow CREATE the outcome. It's kind of like does a tree in the forest make a sound if there's nobody there to hear it. Just depends on how you define "sound". If it's pressure waves in the air, definitely yes. If it has to be received, then no. Dumb question.

  • Reply John Sikes September 10, 2019 at 10:09 pm

    You can only prove the Earth is round, given a year in about 10 million different ways. My choice, thinking about it for about ten seconds and shooting for simplicity to accomplish and an easily understood outcome, would just be to set up an equatorial telescope mount accurately at different locations using the standard criteria (leveling, etc.) You can easily use trig on the data then to show that the Earth is round, given the pointing elevation at each position on the Earth, which is always parallel (axis of rotation) to track any given star accurately.

    Time lapse Star tracks, relative to a reference would work, as well, actually really exactly the same thing, though, when you think about it, just a bit different math. You could get a rough idea with a time lapse of stars at the NP, SP, (different directions of rotation) Equator, (with some tracking straight, AT the zenith) and a few latitudes in between, same idea. Plenty of ways to do it without much travel, as well, like the well experiment of the "distant" past.

  • Reply Kerri Farrelly September 13, 2019 at 1:46 am


  • Reply Moonrunner September 13, 2019 at 8:25 am

    Physics says.. quantum mechanics is weird.. then what would be considered normal in that field?

  • Reply Aizaz Ulhaq September 14, 2019 at 1:54 pm

    i dont know why, but i think this video is sponsored by Marvel

  • Reply sheryl Manz September 18, 2019 at 2:56 am

    the video is somewhat okay he could of left the cat part out … not nice for people to harm animals.

  • Reply Ketter September 19, 2019 at 3:09 pm

    I wonder, given many worlds, should not the double slit experiment then show an interference pattern even when observed?

  • Reply Muse September 20, 2019 at 2:00 am

    Not so crazy to think about when you add simulation theory to it. They both go quite well together.

  • Reply Thereal Swinery September 20, 2019 at 2:33 am

    "In a purely deterministic Universe, what happens to free will?"

    Free will exists neither in a deterministic nor probabilistic Universe. If that's what you're looking for, you're going to need to come up with a third option.

  • Reply Juan Carlos Rodriguez September 20, 2019 at 3:13 am

    Rick Sanchez approves this video

  • Reply Luis Martinez September 20, 2019 at 4:52 am

    Bruh my English teacher is low key teaching us this stuff ?

  • Reply Jeffrey Koenig September 22, 2019 at 2:15 am

    Dude! Iron your shirt.

  • Reply stu Lee September 22, 2019 at 7:23 pm

    but the quantum eraser experiment with the delayed choice; actually changes the history of which path a photon took ; so in theory this should work with stars that are billions of light years away! I don't know what others think; but it seems to me that there is some kind of super computer that is running this universe, if that is the case then we really are in some kind of a simulation! so the many worlds theory, could be more like the many 'levels" theory. and another version of you and me exist on or in these potential "other levels" but the other world's or 'levels" are inanimate until we make our choice, they have to be; otherwise every time we made a choice and moved to the new world or "level" there would be 2 of us . right? does anyone agree with that ? it's very complex and we're still only scratching the surface.

  • Reply Krusty The Clown September 23, 2019 at 12:10 am

    Could the thickness of the double-slit plate, maybe explain the pattern? Meaning, some of the particles will hit the inner side of one of the holes, and therefore will bounce of 45 degrees or something other skew angle?!? And are the cancellation of waves the same thing they use in eg. headphones with noise cancellation? Regards from Krusty in Denmark, Copenhagen. 😉

  • Reply MrMono360 September 23, 2019 at 10:41 pm

    Sounds like we're in a simulation of all possible outcomes

  • Reply Spiritual Scientist September 24, 2019 at 6:36 am

    If there is a god observing all, then there is only one reality.

  • Reply Zenon September 26, 2019 at 1:14 am

    this is the quantum woo shit i hate. Deepak Chopra and Sean Carroll should have their scientific credentials revoked. Assuming multiple world's (with no evidence) is what religion does, not Science; Science is supposed to be evidence-based. And the fact they call multiple-worlds theory a 'theory' is also irritating because most scientific theories are fact-based, and calling multiple-worlds a 'theory' draws a false equivalency with true things like the theory of gravity, heliocentric theory (the 'theory' the earth goes around the sun), etc. So, interesting thought experiment – but don't call it science. Multiple worlds theory is science FICTION.

  • Reply kevin dave September 26, 2019 at 10:52 am

    Hey myself! Yes, you. The one who isn't a sore loser at life. Would you mind switching places for a second?

  • Reply Gareth Johnson September 27, 2019 at 10:23 am

    Thanks for making this semi-understandable for idiots like me. Great series!

  • Reply Bala Subramanian September 27, 2019 at 1:55 pm

    Many worlds , Copenhagen or what ever else are merely explanation created with words and organic minds of current societal space time framework. They are neither complete nor even meaningful. Reality is the same microscopically as well as macroscopically. Like wise reality is the same in classical and quantum mechanical sense.

  • Reply Biednymaniek September 27, 2019 at 11:04 pm

    Wimps and t-bosons destroy it self ?

  • Reply Biednymaniek September 27, 2019 at 11:12 pm

    Who is wimp? ?

  • Reply Aussie Gamer September 28, 2019 at 10:00 am

    Does that mean the best version of me.., is keeping me down?
    So.., I just need to travel to his world and take him out. Or push myself to do better, which in turn would branch of shittier versions of myself, lol. Poor bastards.
    Sounds like we are just fighting ourselves for top position

  • Reply Alex Krycek September 28, 2019 at 12:50 pm

    Every decision you make affects another you

  • Reply Cassie & Alexis Tube September 28, 2019 at 7:20 pm

    good think i watched da flash

  • Reply jikok4alol September 29, 2019 at 12:06 am

    I'm going to open a bagel shop to compete with my local "Einstein's Bagels" location, and I'm going to call it "Schroedinger's Bagels". You get a bag and your bagels are in the bag… Or theyre not. It depends on whether or not you looked.

  • Reply Magnus Holmgren September 29, 2019 at 10:19 am

    Explaining physics using only the 1000 most common English words sounds like Randall Munroe's thing.

  • Reply insert decent name here September 29, 2019 at 4:11 pm

    I know that this is probably a hella novice question, but why can’t there be your universe repeated? If it’s a choose your own adventure, and every other universe also happens, what’s to stop the same thing from happening over and over again?

  • Reply SHADOWGOD GAMES September 30, 2019 at 3:40 am

    Been over a year where is the video proving the Earth is round?

  • Reply Kenisha Hammond September 30, 2019 at 3:05 pm

    We do live in other possibilities, you have an imagination that creates all of it, it's the one you choose to focus on.

  • Reply 21 TRUTH IS NOW! ALL IS NOW!! September 30, 2019 at 7:32 pm

    Earth is only round as in a flat rounded plane with more planes outside of its circle and more inside of our center area, the old lands where past civilisations / the "ET's" come from BUT do remember that ET's means Extra-Terrestrials and just means the others on earth / Terra from the other rings of the Tree of life "The rings of the tree of life we live in " so the old lands are outside the ring we are in and the new lands are inside of its center, earth is not ball round, there are 2 sides of the flat domed disc which together is ball like i a sense but we are only on one side, so he wont be able to prove anything other than flat round , since globes cant be proven inside the place where we are living, because we are only on half of the disc and cant see the other side but will someday be able to enter it, maybe even sooner than u can believe, and when possible be able to go there to know about it AGAIN, it is hidden from us now and only hinted to us because that a lot / most people are very very primitive and not worhty of getting there and not able to even underrstand it / think for themselves, a god tip is get off the fake globe belief and research will become way more real and make way more sense, and ofc it will bcs the globe has no realness to it as such other than it is a manipulated version of the 2 sides and its 2 main poles in the true north area as we know it, anyway dont comment if u are a negative person, i might not even asnwer anyway since i dont waste time on primitive negative people and opinions 🙂 take care

  • Reply Dmytro Picky September 30, 2019 at 8:15 pm

    the only colaps here is of human logic. i would be embarrassed to place our knowledge as anywhere near of how things really work. we just got some observable proportions right. no more!

  • Reply xTern October 2, 2019 at 12:51 am

    Why does this guy looks like he's about to sneez ??

  • Reply Jamal X October 2, 2019 at 1:00 am

    S/o to trillionnaire Me

  • Reply Andy Shreene October 2, 2019 at 11:40 pm

    Both those interpretations sound wrong

  • Reply STAGGERLEE October 3, 2019 at 9:01 am


  • Reply Jack L October 4, 2019 at 8:13 pm

    This is true. We used to live in a timeline where it was the Bernstein Bears, but now we are in the Berenstain world.

  • Reply I F*****g Love Techno October 5, 2019 at 7:20 pm


  • Reply Doc T October 6, 2019 at 7:18 am

    what I cannot wrap my head around is how does measuring a particle, increase The predictability of that particle's motion

  • Reply Bonz Bonz October 6, 2019 at 2:20 pm

    In my understandings as science states Energy is neither created or destroyed.
    Everything on any level of size or state is connected. All particles have an electromagnetic field around them which interacts with everything it surrounds.
    And there was a mention of particles have a bond or share a connection no matter how far away they are.
    Well a real life example isn't that like people and our thoughts and many people have examples of thinking about an object or a person then literally it appears in there life soon after. It's that law of bonding in action I think.
    And in my personal opinion there shouldn't be a disconnection between why it went from a wave to a partical. They go hand in hand.
    When you use a multimeter, but the type that you place over the wire your testing it's not physically touching but picks up the volts. That's using a wave isn't it? Electromagnetic induction
    Here's one- as part of a healthy diet and physical makeup do we consume any metal?
    Periodic table of elements – 11 is NA sodium, didn't expect it to be on there. Further reading said sodium can be a soft metal also but it's a partical that helps the structure of our body. Where does it change from one state to another? If you know please tag this comment with a reply would love to know.
    When things are at a smaller scale or it seems a higher vibration it turns into a liquid or gas or more of a possibility. its when it slows down it turns into a solid. Example water. Ice water steam to get to one another your simply slowing or speed up the vibration of the atom. But it's the same atom.
    Made me think of the quantum tunneling
    To me when they say scientists can't figure out how it goes from a wave to a particle. It's one of the same just when it combines with other atoms it becomes a physical object. Which like a ice cube is not likely to evaporate into air like steam but it's the exact same particle just different vibration/wave.
    Humans are physically here because of a massive combination of atoms. But we still have that wave hence why we experience things like manifestation.

  • Reply Bonz Bonz October 6, 2019 at 2:29 pm

    Many worlds theory reminds me of fractals for some reason

  • Reply maria abdullah October 6, 2019 at 7:03 pm

    my brains hurt

  • Reply Chaka October 7, 2019 at 5:57 am

    its 2am, im stoned and tired and this video is just too much to fathom lmao. if this is how it is it would be hard to justify or not justify any action

  • Reply Chaka October 7, 2019 at 6:09 am

    imagine explaining these theories and facts to people 100 years ago and how foolish and irrelevant they would be, now this is common theory and something thats studied every day, imagine where we will be in 100 years from now….

  • Reply Anders Estes Jacobsen October 7, 2019 at 4:45 pm

    Starts out good, by demonstrating how ridiculous the Copenhagen inrtrp is. Then does the same thing as Sean Caroll does, and stumble straight into fantasyland. I am sure, in 100 years we will know the secrets of QM, and our generation will be compared to early humans explaining invention of fire with magic.

  • Reply Luke Davidson October 9, 2019 at 4:30 am

    Little unfusionals created the universe

  • Reply Speak out and remove all doubt! October 9, 2019 at 4:08 pm

    I believe after graduation Everett went to work for the U.S. Navy Research Division, posted predominately at the Philadelphia Naval Shipyard in Pennsylvania. Records show he was a VIP guest on the USS Eldridge in the early 1940's.

  • Reply DeadEndFrog October 10, 2019 at 12:15 pm

    either way if there are other versions of me, its only this version that matters. (to me duh)

  • Reply Molly McDade October 10, 2019 at 2:56 pm

    The weird thing about the wave function is that every particle takes it's place on the pattern.

  • Reply Molly McDade October 10, 2019 at 3:21 pm

    Question though, seeing as the multiverses are hypothetically unconnected, doesn't theorizing about multiverses connect them, thus making the argument invalid?

  • Reply zabawaj handsome October 12, 2019 at 11:42 am

    Didn't understand … Again .. fuck how the fuck do I understand this

  • Reply Gustavo de Oliveira October 13, 2019 at 12:25 am


  • Reply prjgrudge October 15, 2019 at 4:09 am

    The wave function collapses when a probable wave function enters physical reality. All the other probabilities are still there but, not in physical reality. They spin off into other realities. Those realities are just as valid as the physical one we are in now. I think you can draw conclusions about larger objects as well. Take a person. In this reality, that person is a doctor. However, that person daydreams about becoming a pilot. In another probable reality, that person IS a pilot. His consciousness created the other pilot reality just not using the "building blocks" our our physical reality. Units of consciousness is the root of all probabilities and is the basis for reality. That fact that the thought didn't become a physical reality is irrelevant. If people have consciousness so does everything else from rocks to trees to electrons. From a classical POV, that rocks atoms must stay in that configuration, generally speaking of course, where the wave function has collapsed into physical reality. The interfere patterns are due to electrons moving from one reality to another all at the same time. We can only measure when the electron shows up in our reality. So , all energy from all realities is shared through these units of consciousness which do travel faster than light. Again, units of consciousness are the smallest unit of energy that form into physical realities or not. The deciding factor is focus and intent. Once in physical reality that energy has slown down then forming the matter we can see or measure.

  • Reply Flowtoolz October 15, 2019 at 9:12 pm

    07:39 lol

  • Reply Hair October 17, 2019 at 3:08 am

    light acts as both a wave and a particle that moves at a speed where time ceases to exist. is it the same photon, if the photon is emitted from a single point in space, that is then observed by 2 different points at 2 different times?

  • Reply Eric Ulric October 18, 2019 at 10:28 pm

    That was the best and shortest explanation of the double=slit experiment I have ever heard. Great Job!

  • Reply derSchweiz October 19, 2019 at 6:06 am

    If its true and if only we can send ourselves to that specific parallel universe that align with everything we ever wanted from wealth to external politics and environment around us, or the perfect world.

  • Reply Oliver FORDE October 20, 2019 at 12:54 am

    Most people who watch these vids smoke weed I think ahah

  • Reply Fractal mind October 20, 2019 at 2:32 pm

    a cool thing conciouness could be is the methode to sway the average of the wave functions.

  • Reply Anthony C October 22, 2019 at 3:24 pm

    Our dreams are us getting a glimpse of the alternative universes

  • Reply Declan Griffin October 22, 2019 at 6:05 pm

    Erwin Schrödinger makes fun of the quantum superposition theories…
    Accidentally creates a multiverse theory that makes sense.

  • Reply Skylar Dravin October 22, 2019 at 8:17 pm

    If "observation" (measurement) collapses the wave function, why do the particles not land the same way under the same circumstances but make a wave pattern? The wave function should not build a wave over any other pattern; something determines that multiple particles in the experiment over time cause a wave pattern from interference rather than the same spot or area being hit (and growing) from the wave collapse.

  • Reply rave d October 23, 2019 at 7:47 am

    Weather balloon with a camera will prove the earth is round

  • Reply Roble Viejo October 23, 2019 at 11:21 pm

    8:48 Ok. I understand now. I just need to make contact to be sure.

  • Reply Casey Green October 25, 2019 at 12:21 pm

    What happened to those weird theory videos on YouTube now it’s all main stream videos

  • Reply Dolly Dupee October 25, 2019 at 8:21 pm

    Likeness merges the quantum and classical realms. I think this is not always the case depending on the quantum which is the other reality personality positive to negative and everything in between would depend on if all quantum realities want to merge.

    Are classical world is us today are quantum realm or reality may be nobody likes to give birth everybody is grown or they give birth to eggs that. Every reality is different.

  • Reply woop October 26, 2019 at 6:38 am

    Compression algorithm lol

  • Reply Lance Prior October 26, 2019 at 12:33 pm

    So in the double slit experiment one wave function is enough to produce all the photons at each detector in the many worlds?

  • Reply Nathan Okun October 26, 2019 at 1:52 pm

    Note that the "Many Worlds" concept is based on all of those worlds being variants of the same basic set of physical laws – a pachinko machine result out of an infinite number of bouncing balls going down the wall of pins, with us being only ending up in one of the infinite number of bins at the bottom (actually, it never ends as more random choices keep being made forever). This is completely wrong in that there would be an infinite set of such machines EACH BASED ON TOTALLY RANDOM SETS OF RULES, with only a tiny number of such creating things that are conceivable to us. This is an OMNIVERSE with an infinite number of completely independent multiverses, each based on inconceivably different principles, coming and going an infinite number of times. Such a place has no rules whatsoever and we exist simply due to a random fluctuation creating our temporarily quasi-stable multiverse set, which will eventually destroy itself and go away as it expands into eventual nothingness. Most of these sets of "multiverses" would be based on principles that are so alien that we would never even know that they are there because our sets of parameters, time and space and particles and waves and forces and so forth, do not apply to them (a few might be detectable by a sensor slightly wiggling on a dial, but most would not even give that). They would of course be inconceivable to each other, too, as would our multiverse to them. Once you think Everett might be right, the whole thing expands infinitely…

  • Reply Strattino October 26, 2019 at 2:50 pm

    This video is where Endgame's time travel laws come from

  • Reply juanita gonzalez / Queen isis ILLUMI LIFE! October 27, 2019 at 10:28 am

    Your so handsome

  • Reply Mikey mike October 28, 2019 at 12:40 am

    What is physics?

    Answer that, please.

    Isn't physics measuring objects with a mass?

    All of these theories, multiverses, many worlds, dead or alive, superimposed, entangled or not are a beautiful mathematics, but a physical reality is registered via a cognitive measurement; ergo these wonderfully fascinating theories of many worlds will never be real, will never be physics.

  • Reply David Appell October 28, 2019 at 1:41 am

    In the beginning — the multiverse and Everett’s worlds are not at all the same idea!

  • Reply Martin October 29, 2019 at 2:05 pm

    Our brains have evolved to understand what's happening at the macroscopic scale. We can't perceive what's happening at the micro level, so we have to make guesses and try to find evidence of it in how it affects things we can see at the macro level. We need a better way if we're going to get to the truth about the nature of reality.

  • Reply Alan Roberts October 30, 2019 at 9:13 am

    Llambda is common, charge and thermodynamic radiant repulsion, slipstream, interlacing path of least resistance. Polarity based bonding, and contact work done heat, melt lamination.

  • Reply chompachangas October 30, 2019 at 10:57 am

    “Don’t worry! On another Earth it already happened’,”

    ― Terry Pratchett, The Long Earth

  • Reply Michael Jaegers October 30, 2019 at 3:09 pm

    That's it! I'm killing my double and flipping to a different multi-universe..

  • Reply KipIngram November 1, 2019 at 10:59 pm

    Many Worlds is a completely ridiculous idea. There is one reason, and one reason only, that a certain type of scientist (the arrogant type) gravitates to it: it allows them to claim that they know everything and all the problems are solved. Ok, maybe not "all problems," but problems related to quantum theory. No explanation for collapse? No problem – just toss it out and pretend it doesn't exist. Never mind that it is happens all around us all the time. Consciousness is related to collapse? Heaven forbid no – we can't explain consciousness so it can't be allowed in the picture at all. Dan Dennett even denies its very existence. Put him in the arrogant club too (though I think in the case of denying consciousness part of what drives people is anti-religious-ness). Acknowledging consciousness as something important doesn't mean you are acknowledging the existence of God, but somehow they think it adds an extra line of defense.

    Many Worlds adds a ridiculous amount of complexity to the world. We are conscious/self-aware, and that MAY have something to do with some part of physics. We just need to start trying to see how much of this stuff we can figure out rather than waving it away.

  • Reply Nirvana Love November 3, 2019 at 12:12 am

    Choose a more awesome version of you and steer towards the best Possibilities! Priceless! Thanks.

  • Reply Paul Espinoza November 3, 2019 at 8:49 pm

    I don't think my tiny brain was meant to understand this. Guess I'll go back to playing Mortal Kombat.

  • Reply Ddd Nnn November 4, 2019 at 6:52 pm

    Parallel worlds are slices of time, time in the future and time in the past from the world you are in. Its infinite and multiplying exponentially creating new worlds that create new worlds that create new worlds. Look at a mirror that infinitely shows the exact same image endlessly..

  • Reply James Bryant November 5, 2019 at 1:19 am


  • Reply Riku Haku November 5, 2019 at 2:07 am

    am i the only person that doesn't understand a single fucking things this man is talking about ?

  • Reply Kobil Shakur November 5, 2019 at 1:15 pm

    Military research? Oh god

  • Reply Bob Aldo November 6, 2019 at 9:37 pm

    "Merges into the observer's reality" says Copenhagen ? Is that phrase an attempt to get around the Copenhagen interpretation's idea that the wave collapses when it is observed? The princess kisses the frog and he becomes a prince. Does it mean that in the "observer's reality" the frog was already a prince?
    Also, I do not know why people who talk about or against "many worlds" invariably bring up "decisions" humans make – as if that were somehow an integral part of the theory. Why do people make the theory seem to be about people when it is simply about the math? Is it because the loss of the naive idea of "free will" makes it too "philosophically unsettling" for them"? Does it simply threaten their egos too much? And then there is always mention of the "near" infinite number of universes. Why not just cut out the word "near", and admit of the truly inconceivable infinite?

  • Reply X Gen November 7, 2019 at 4:14 am

    I hope people enjoyed my presentation of this video in a parallel universe.

  • Reply c ball November 7, 2019 at 5:56 pm

    I blame Wagner's friend.

  • Reply Cory F November 8, 2019 at 1:13 pm

    can alternate timelines reconverge?

  • Reply Total Control 871 November 9, 2019 at 7:32 am

    how do you think it affects us when one of our alternate reality selves dies?

  • Reply tankapples November 10, 2019 at 8:24 am

    And you end up with the "Mandela Effect" byproduct.

  • Reply Zes November 10, 2019 at 9:05 am

    no such thing as well known or accept or taken seriox or parsimox or economx ofx , more is ok, cepitx, do, be, think any no matter what and any be perfect, a studenx etc or not doesn't matter

  • Reply camhead2001 November 11, 2019 at 4:40 am

    i know i always had a feeling that i was supposed to be somewhere

  • Reply Carl Browitt November 12, 2019 at 12:52 am

    If there is a multi verse , is it infinite??

  • Reply Carl Browitt November 12, 2019 at 12:54 am

    Circles within circles, worlds within worlds…

  • Reply hurcikovakat1 November 13, 2019 at 3:09 pm

    Ahh my spider senses are tingling right now after watching this.
    What a clear and delightful explanation of multiverse from scientist point of view
    Thank you!
    I hope that people will finally learn en masse how to consciously choose between the universes as some have already done and are doing.

  • Reply Kayla Herndon November 14, 2019 at 9:58 am

    The possibility of alternate versions of oneself is actually a little lesser than a Googol; about 10^10^70.

  • Reply Sam November 14, 2019 at 1:20 pm

    Another me marries Physics girl? Sweet!

  • Reply John Barber November 14, 2019 at 2:46 pm

    Umm. Uh, pickles are good.

  • Reply Life's truths November 16, 2019 at 3:03 am

    The cat cannot collapse the wave function because it is part of the creation and not the observer. The observer is the one creator and the observed outcome will align with their mindset, while all outcomes have come to fruition. It was originally, vial, hammer, line and candle, why change it ?

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