Did the Big Bang Break the Laws of Thermodynamics? With Sean Carroll

Why did the Universe have such low entropy at the start? Are the laws of physics consistent across the multiverse? Can we see evidence of other regions of the multiverse? Sean Carroll discusses thermodynamics and the Universe.

[reocejacobs]

“Almost everyone believes that the universe, and time itself, had a beginning at the big bang”- Stephen Hawkings

[reocejacobs]

"The multiverse is worse than useless as an explanation of the finely-tuned initial conditions because the multiverse predicts hyper-exponentially more tiny universes than large ones like ours." - Roger Penrose, Oxford physicist

[devarshnayyar]

There is a question
If entropy cannot decrease
The big bank theory states disorder of energy decreased as energy collected at a point
This contradicts as disorder decreased

[DanielFoland]

Dr. Carroll always does a great job explaining things.

[Stragemque]

for a five minute video i am impressed; well explained. thanks

[reocejacobs]

"The Big Bang, we don't know if it was the beginning of the universe or not" - Sean Carroll

[reocejacobs]

"What does it mean for something to exist if you can't observe it?....I think that's a discussion that belongs safely in the realm of philosophy. People can believe in the multiverse all they want — but it's not science." - Sabine Hossenfelder, physicist at the Frankfurt Institute for Advanced Studies in Germany

[reocejacobs]

"The answer to the question, “Did the universe have a beginning?” is, “It probably did.” We have no viable models of an eternal universe. The BGV theorem gives us reason to believe that such models simply cannot be constructed." - Vilenkin

[luckyyuri]

All the folks here that jump to conclusions accusing Carroll of unreasonable statements.. well, they clearly don't have a single clue about the titanic work behind these affirmations. They only hear these silly explanatory sentences intended especially for the understanding of 5 year olds, and they presume that this is how this man got to them.

My dog is certain that i'm stupid and that i do stupid things. But unbeknownst to him i might be reading a very interesting book, and not just wasting time looking at a dead and tasteless piece of paper. Things are not so simple and certain as they appear.

[Brammya]

I wish he wouldn't use the word "theory" when he really means "hypothesis". He knows better

[quagmire]

Can anyone answer me a question?

I've heard many physicists talk about bubble universes or multiple universes existing in that way. If thats possible, whats the space that the bubbles(universes) are occupying? Wouldn't that just be more space?

He mentioned 2 bubble universes bumping into one another, so that means the bubbles are clearly floating or moving within some area of space.

[Toede]

That suit Breaks the Laws of Thermodynamics though, it's burning my eyes ¦P

[TheTwick]

I once heard that the multiverse explained the 'fine tuning problem', e.g., some universes are "duds" and ours is not. Is this still a thing or is 'fine tuning' not valid concept anymore?

[reocejacobs]

"It is very difficult to devise a system – especially a quantum one – that does nothing ‘forever, ’ then evolves. A truly stationary or periodic quantum state, which would last forever, would never evolve, whereas one with any instability will not endure for an indefinite time." - Anthony Aguirre and John Kehayias

[dr.mikeybee]

And the Lord said "let there be bang."

[Johnsmith-hptw]

Nothing that has ever happened has violated any of the physical laws.

[omaxman]

here is the quick recap of this video- there was nothing, nothing exploded and here we have everything.

[letMeSayThatInIrish]

Imagine you're at the boundary between two 'universes' where particles from each universe interact. Would the laws of interaction be derived from both universes at the same time? Or would there be meta-laws dictating the interaction? If two such meta-systems interacted (four universes total) would there be meta-meta-laws to handle this?

[michaelralph]

If the big bang happened, It would be possible to run my car on nothing

[Zayden.]

The universe obviously has energy, not "zero energy" as Carroll says. As such, in accordance with the first law of thermodynamics, the universe is eternal, always existed and always will.