0
votes
0answers
49 views

Can Vacuum be non-causal ? [on hold]

It might be a really silly question, but I was wondering if there is any argument which disallows that Vacuum is non-causal in Field Theory and all excitations/disturbances be causal ? Clearly even ...
12
votes
2answers
677 views

Does string theory have a notion of vacuum?

Does string theory have a notion of vacuum? If yes, what is known about it?
1
vote
1answer
269 views

String theory landscape and false vacua

What is the multiverse of string theory? I always thought it would be from brane cosmology where there's chances for multiple collisions of the branes that can make a universe. So this "multiverse" ...
2
votes
5answers
422 views

Can computers survive bubble nucleations?

According to string landscape theory, our vacua with a cosmological constant of $10^{-123}$ is a metastable vacua which can decay to a supersymmetric vacua with either a zero or negative cosmological ...
4
votes
1answer
286 views

What are the current (popular(ish)) approaches to modelling the quantum nature of spacetime at the Planck scale?

My guess at a list of them would be: spin foams, casual sets, non-commutative geometry, Machian theories, twistor theory or strings and membranes existing in some higher-dimensional geometry... ...