- #1
Suekdccia
- 352
- 30
- TL;DR Summary
- According to Coleman's Baby Universe model, would different baby universes have different fundamental laws of physics?
I know that this is speculative and that discussing theoretical models with no evidence supporting them is probably pointless, but I'd like to ask a question about Coleman's baby universe model to understand it better and clarify some questions I have about it:
In this article (https://arxiv.org/abs/gr-qc/9408023) Andreas Albrecht points out (section 2.2) that according to Sidney Coleman baby universes theory (https://inspirehep.net/literature/260855 & https://inspirehep.net/literature/261806), the fundamental laws of physics wouldn't be fixed between universes, and therefore, their fundamental symmetries and laws would not be really defined by a single Theory of Everything (TOE) (like string theory, M theory, loop quantum gravity...).
This is also indicated by Andrei Linde in one of his papers (https://arxiv.org/abs/hep-th/0211048 section 5, page 12) where he says that, with Coleman's ideas in consideration, we could wonder not only whether there would be a fundamental theory of everything and then many possible realizations in form of different vacua, but also whether there is a fixed fundamental theory to begin with (which, according to Coleman's framework, if I understood it correctly, there wouldn't be such fixed fundamental or ultimate theory)
Finally in this other article by Holger B Nielsen (https://inis.iaea.org/records/gtfsx-f8m74), who has proposed in his idea of "random dynamics" (https://inspirehep.net/literature/233587) that there are no truly fundamental symmetries and laws and they instead emerge from a random state (akin to Wheeler's "Law without law" idea) talks about how, in Coleman's framework, the presence of wormholes in the "quantum foam" of spacetime, would make it impossible to distinguish between any theory of everything, because as parameters would vary randomly, we couldn't know which theory of everything would be hidden at Planck scale, and it would be as if a random theory of everything was describing the universe
All of this has me wondering: Then, considering Coleman's model for a moment, would different baby universes have different fundamental symmetries, laws of physics and would appear to be described by different UV-microscopic theories of quantum gravity/theories of everything?
In this article (https://arxiv.org/abs/gr-qc/9408023) Andreas Albrecht points out (section 2.2) that according to Sidney Coleman baby universes theory (https://inspirehep.net/literature/260855 & https://inspirehep.net/literature/261806), the fundamental laws of physics wouldn't be fixed between universes, and therefore, their fundamental symmetries and laws would not be really defined by a single Theory of Everything (TOE) (like string theory, M theory, loop quantum gravity...).
This is also indicated by Andrei Linde in one of his papers (https://arxiv.org/abs/hep-th/0211048 section 5, page 12) where he says that, with Coleman's ideas in consideration, we could wonder not only whether there would be a fundamental theory of everything and then many possible realizations in form of different vacua, but also whether there is a fixed fundamental theory to begin with (which, according to Coleman's framework, if I understood it correctly, there wouldn't be such fixed fundamental or ultimate theory)
Finally in this other article by Holger B Nielsen (https://inis.iaea.org/records/gtfsx-f8m74), who has proposed in his idea of "random dynamics" (https://inspirehep.net/literature/233587) that there are no truly fundamental symmetries and laws and they instead emerge from a random state (akin to Wheeler's "Law without law" idea) talks about how, in Coleman's framework, the presence of wormholes in the "quantum foam" of spacetime, would make it impossible to distinguish between any theory of everything, because as parameters would vary randomly, we couldn't know which theory of everything would be hidden at Planck scale, and it would be as if a random theory of everything was describing the universe
All of this has me wondering: Then, considering Coleman's model for a moment, would different baby universes have different fundamental symmetries, laws of physics and would appear to be described by different UV-microscopic theories of quantum gravity/theories of everything?
