Saturday Morning Physics | The Many Worlds of Quantum Mechanics - Sean Carroll

Saturday Morning Physics
"The Many Worlds of Quantum Mechanics"
Sean Carroll

October 21, 2023
Weiser Hall

[fieryweasel]

"I've been trying to extract the world from the quantum wave function". I...I've been giving serious thought to organizing the garage, so I guess you win, Sean.

[cuzned]

This is probably the fifth time i’ve listened to some version of this talk.
Every time, i’m convinced that i’m mostly understanding him… until an hour later, and then i’m lost again. 😆
That’s a testament to his speaking and an indictment of my learning.

[marianaldenhoevel]

"Can a cat measure it?"

What a silly question. Cats don't measure. Cats rule.

[Solidd-Melb]

What a better thing to do on Saturday morning

[BigAlNaAlba]

Magnificent lecture. Such passion and clarity!

[Iamthepossum]

Loving the Mr Rogers attire here! 😎 I must say that I so much love & appreciate the patience he has with audience members during the Q&As following his talks, as folks ask him the same questions again & again, and he responds with such warmth & kindness to each & every one ❤️ many thanks to the university staff for sharing this one with us as well 💕

[larry]

Is it possible to state this all in layman’s terms as this: that classical physics is a subset of quantum physics and so we have to make classical physics obey the rules of its “parent” not vice versa. And related to that, we might say that Einstein’s inertial frames of reference are only tools to allow us to understand the universe, but aren’t really real. In other words you have to think of the observer as “static” to measure the rest of the universe, even though everything including the observer is in “super position.”

[lblm]

Wow! this has explained so much. Thanks, Sean

[entmiami]

Wow! Sean Carroll’s lectures are amazing.

[rudykrutar]

I had a friend who was a Rhodes Scholar
and had visited Schrödinger in his home.
I told her his cat was obviously a tabby
as the stripes were a diffraction pattern.
She agreed.

[pyropulseIXXI]

The waves are litearlly orthogonal, so 'parallel universes' is just a misnomer. They are just part of the same universe but waves that are independent of each other. And believing in orthogonal electrons and not believing in orthogonal entire 'universe waves' is just oafish; you cannot believe in quantum mechanics without also believing in 'many worlds' unless you are so low IQ that you don't see this blatant contradiction.

[pharaoh]

Speaking absolute nonsense with great confidence and perfect coherence to a math equation and you still have nothing but absolute nonsense, but you will gain a boat load of followers with no gifts of critical thought, and who are not nearly as bright as they think they are.

[lv]

To paraphrase Feynman “Anyone who thinks they understand quantum mechanics, doesn’t understand quantum mechanics “.

[petermiesler]

31:00 Don't get me wrong, I admire Professor Carroll and have read a number of his books with thorough enjoyment and much learning - but, what I still can't digest is that quantum behavior is observed at the tiniest scales, but even the smallest particles we can discern with our eyes, like a grain of sand contains more atoms then the universe contains stars.  
Scale matters.
For instance,
Individuals are thoughtful and considerate, but put hundreds or thousands of individuals into a town square listening to a passionate orator and they become an unthinking mob, ready to behave in ways, the individuals never would.


Scale matters, why is that aspect so often glossed over in these discussions?

[warrenholub]

Thinking about Quantum Mechanics is like staring into The Sun...

[wdvest]

Carroll's bio is as interesting as his lectures.

[frankkolmann]

Many universes NOT many worlds. Cannot be tested. Cannot be proven. Makes no testable predictions.
You may as well be lecturing Star Trek Warp drive, you are speaking Science Fiction.

[palidolphins]

Sean Carroll kinda bugs me for some reason. Just s little.. Neil DeGrasse Tyson on the other hand, is insufferable, Condescending and pompous.

[davidmccarthy]

Sean Carroll is genius, shining the light on how our world actually works.

We shouldn't exist, because far too many things have gone exactly our way many times each and every second since T=0, but many worlds explains how we all got just so dam lucky....

If you don't understand it yet, keep learning.

[jaybeaton]

Sean’s explanation is the best lecture on QM that I don’t understand.