Alternate universes cant exist?

...

Arguing for Free Will is just absolutely retarded. Even if you could prove it so what? Those arguing that Free Will doesn't exist aren't tell you that you have no choices. That you can't say no, or that you can't change your mind. We are constantly changing so choices, mind changing, and arguing and changing the opinions of others is possible.

...

By alternate universes, I mean it in the way of the string theory where for every choice you make, there is a reality where you didn't.
I just don't see how we could make any other decision if it's already in the process of being made.

I'm not saying you don't have free will and can't make choices. I'm just saying that they are all set in stone.
And if they are all set in stone, how can other realities that mirror our own, except for tiny (or large) differences exist?
Also, if it's this simple to disprove it, then why do so many great minds believe it's possible?
The only way I can think of this being possible is if time travel was invented
and someone went back in time and made a change.

free will is the choice of the individual

Stephen Hawking believes alternative Universes MUST exist because of uncertainty theory. Basically he believes human agency is just a bunch of predetermined factors relative to the universe but everything on a quantum scale is inherently random. For everything on a quantum scale to be random yet still make sense in the universes natural systems there must exist universes with different laws than our own in order for uncertainty theory to make sense

What do you you believe in user?

Does he believe string theory though? Or just that there is more universes out there, but they are separate from our own?

I do believe in alternative universes. Because I also believe in eternal return theory, where the universe is infinitely oscillating between states of entropy (that is to say, it is ending and being reborn infinitely) This only works in a finite universe with a finite set of states (this universe) which would imply alternative universes with different laws of physics

I love the eternal return theory, because its sound from not only a physics and cosmological level, but is integral to many religions as well. See also "The longest Length of Time" I think Numberphile on YouTube did a video on it

trip check