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Suekdccia

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- TL;DR Summary
- Could different laws of high energy physics take place in cosmological inflationary models?

I am have some questions that have arisen while reading an old but interesting article by Andreas Albrecht [1] that cites an article by Andrei Linde in the 90s on cosmic inflation [2]...

Albrecht's paper is related to his ideas on "clock ambiguity" in which he proposes that the laws of physics (even the most fundamental ones) could have been different. On page 9-10, he says:

"

So he cites a couple of Linde papers related to this topic, one of them being [2]. I am reading it and I have some important doubts:

1. I have always read that in inflationary models dealing with multiple universes, they would have different physical laws at low energies (low-energy laws of physics) but from what Albrecht says in his paper, could it also be possible that they could have different fundamental high energy laws of physics?* Does the paper of Linde [2] deal with this topic, as Albrecht seems to indicate when citing it?

2. If so, what conditions would have to be met for this to be possible? What would there have to be in the universe for it to be possible?

Of course since we cannot experimentally prove which inflationary model is right, if any, I am asking this question from a theoretical point of view

[1]: https://arxiv.org/abs/gr-qc/9408023

[2]: https://arxiv.org/abs/gr-qc/9306035

*I found another article by Linde (https://arxiv.org/abs/hep-th/0211048) where he suggests that in inflation theory one may consider that different universes or domains may have different fundamental laws of physics (see section 6, especially towards the end)

Albrecht's paper is related to his ideas on "clock ambiguity" in which he proposes that the laws of physics (even the most fundamental ones) could have been different. On page 9-10, he says:

"

*Many different effective GUT scale theories could account for our observations of the physical world. If quantum cosmology actually forces us to consider a range of high energy physics models as equally realistic alternatives (as I argued in Sect. 2) then the implications for inflation could be very interesting*"So he cites a couple of Linde papers related to this topic, one of them being [2]. I am reading it and I have some important doubts:

1. I have always read that in inflationary models dealing with multiple universes, they would have different physical laws at low energies (low-energy laws of physics) but from what Albrecht says in his paper, could it also be possible that they could have different fundamental high energy laws of physics?* Does the paper of Linde [2] deal with this topic, as Albrecht seems to indicate when citing it?

2. If so, what conditions would have to be met for this to be possible? What would there have to be in the universe for it to be possible?

Of course since we cannot experimentally prove which inflationary model is right, if any, I am asking this question from a theoretical point of view

[1]: https://arxiv.org/abs/gr-qc/9408023

[2]: https://arxiv.org/abs/gr-qc/9306035

*I found another article by Linde (https://arxiv.org/abs/hep-th/0211048) where he suggests that in inflation theory one may consider that different universes or domains may have different fundamental laws of physics (see section 6, especially towards the end)