The many worlds of quantum reality with Sean Carroll

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What is quantum mechanics, and why is it so mysterious? What is the Many-Worlds version of quantum mechanics, and why would anyone find it compelling? How do we explain that Schrödinger's cat is both dead and alive? Isn't it unscientific to postulate an infinite number of unobservable worlds? How can space and time emerge from quantum mechanics?
One of the great intellectual achievements of the twentieth century was the theory of quantum mechanics, according to which observational results can only be predicted probabilistically rather than with certainty. Yet, after decades in which the theory has been successfully used on an everyday basis, most physicists would agree that we still don't truly understand what it means. Sean Carroll will talk about the source of this puzzlement, and explain why an increasing number of physicists are led to an apparently astonishing conclusion: that the world we experience is constantly branching into different versions, representing the different possible outcome of quantum measurements. What does this have anything do to with space and time?
Sean Carroll: The evening’s guide to many existent realities.
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As a person living in Copenhagen I can confirm that my interpretation of these matters is completely irrelevant.

whynottalklikeapirat
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I have often suspected that Sean Carroll is a nice person and now the fact that he will not hurt a cat even in a thought experiment confirms my suspicions. What a nice guy.

josephselkow
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As a cat, I can confirm this theory is correct... and complete nonsense.

smartcatcollarproject
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Many worlds is religion, not Science. Still i'm a huge fan of Sean Carroll.

domcasmurro
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Sean Carroll is an amazing educator! Respect.

zaratustra
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Carroll never made it out of Copenhagen.
Last time he was seen was on his way to the airport.

eyebee-sea
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Damn, I love to listen to Sean Carroll. He can start with being lost in a forest and explain how to get out of the forest. I would have liked to have a version of him as one of my engineering teachers in the...ahem... sixties. Actually, I did have a couple of great professors.
Just like Feynman, whose desk Carroll resides at, he is a great educator. It;s difficult for an expert to explain something to a student any concept. That's because the expert has internalized it and has forgotten the steps he had to go through to understand it. But Carroll remembers the steps. He and Feynman remember their shock at quantum physics - how they had to abandon all thoughts of common sense. In this crazy psychotic world of QM, particles appear out of nothing - yes, nothing - and then disappear. They ignore Einstein's speed of light and communicate instantly. They are everywhere in the universe at once. Time means nothing to these particles. Space means nothing. Spacetime means nothing. These outlaw particles have superpowers. No wonder Schrodinger's cat wants out of the box- fast!
Thanks, Sean. You, Brian Greene and alkali (sp) are my new fav Science Communicators.

Theon
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superposition of being awake and being asleep i know too well, every monday morning.

Aanthanur
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I now realize the source of my confusion is that my Wave Function has not yet collapsed, and I am currently both Awake AND Asleep....

andrewstrakele
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This was simply brilliant; and I appreciate the fact that no imaginary cats were harmed in the making of Sean Carroll's lecture.

MatthewShute
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40:52 A Copenhagen Interpretation enthusiast finally has enough and leaves in protest

srschriver
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Heisenberg and Schrodinger are on a road-trip. Heisenberg is driving the car. A cop pulls the car over. The cop asks " sir, do you know how fast you were going?" Heisenberg answers "No, but I know where I am." The cop says " You were going 85 miles an hour." Heisenberg answers " Great. Now I'm lost." The cop asks Schrodinger "Sir, what do you have in that box?" Schrodinger answers " A cat." The officer opens the box. Heisenberg looks into it and shouts "You fool! You just killed my cat!"

thedudegrowsfood
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Of course Carroll is right. The only way the wave function would collapse when observed is if it was pathologically shy.

bobaldo
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Thinking of the splits as being created may be a linguistics mistake. Perhaps all of these possible states has and always will exist thus we are merely traveling through them.

JohnKerbaugh
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Sean Carroll shows up and single handedly delivers more views in a month than the previous 4 years of videos on this channel. That is a physics rock star.

wntu
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Any given person both understands and doesn't understand quantum mechanics until you observer them. :P

superusermode
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Sean baby, you have no empirical evidence of many worlds, so calm down hun.

bakedcreations
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🤓Lovely explanation ! I enjoyed this thoroughly ! Thank you from a science nerd ! 😜

strawbrryfld
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"over a few cocktails I have decreased your cynicism and anger over the many worlds interpretation." So it helps to be drunk to buy the many worlds interpretation. Makes sense.

MrJdcirbo
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Carroll both did and did not leave Copenhagen.

AThagoras