Models for Compactification from Inflation?

In summary, there are several papers discussing the topic of evolving extensions to Inflation models, specifically in the context of M theory and string inflation. The most recent paper explores the possibility of evading a no-go theorem for accelerating universes in M theory through a time varying internal space, but raises questions about the expansion of the internal space. Overall, there has been significant interest in this topic since the 2003 paper by Linde and Maldacena.
  • #1
ranyart
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Here is a good paper that is quite neat makes a good case for evolving extensions to Inflation models.


http://arxiv.org/PS_cache/hep-th/pdf/0307/0307179.pdf [Broken]
 
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  • #2
http://arxiv.org/PS_cache/hep-th/pdf/0411/0411093.pdf [Broken]

This is a more recent discussion of how the no-go theorem for accelerating universes in M theory can be evaded by a time varying internal space. However, it seems that the internal space is expanding rather than compactifying.
 
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  • #3

1. What is the purpose of compactification in inflationary models?

The purpose of compactification in inflationary models is to explain the observed homogeneity and isotropy of the universe on large scales. It involves the process of reducing the number of dimensions in the early universe, resulting in a more compact and uniform universe.

2. How does compactification occur in inflationary models?

Inflationary models propose that the universe underwent a period of rapid expansion in its early stages. During this expansion, the universe was filled with a scalar field that caused the universe to expand at an exponential rate. As this field decays, it can also cause the universe to compactify, reducing the number of dimensions.

3. Can you explain the concept of extra dimensions in compactification?

Extra dimensions in compactification refer to the additional spatial dimensions that are theorized to exist beyond the three dimensions of space that we experience in our everyday lives. These dimensions are compactified, or "rolled up," in the early universe and are thought to play a role in shaping the large-scale structure of the universe.

4. How does compactification in inflationary models relate to string theory?

Compactification in inflationary models is closely related to string theory, which is a theoretical framework that attempts to unify all of the fundamental forces of nature. In string theory, the extra dimensions of space are compactified in a similar way to how they are in inflationary models, providing a potential connection between these two theories.

5. Are there any observable consequences of compactification in inflationary models?

Yes, there are several observable consequences of compactification in inflationary models. These include the prediction of a flat and nearly scale-invariant spectrum of density fluctuations, as well as the presence of primordial gravitational waves. These predictions have been confirmed by observations of the cosmic microwave background and other cosmological data.

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