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Astronomy and Cosmology
Cosmology
Current Status of Eternal Inflation
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[QUOTE="kimbyd, post: 6059475, member: 622120"] I'm really not sure what you're referring to in these papers. Here are the preprints I could find: [URL]https://arxiv.org/abs/1304.2785[/URL] (Ijjas, Steinhardt, Loeb 2013) [URL]https://arxiv.org/abs/1408.2249[/URL] (Kohli, Haslam 2014) I don't see any reference to the production of singularities. The complaints they made in the first paper are: 1) The models which fit the data best have more parameters than those excluded. 2) The models which fit the data tend to require more precise choices for those parameters. 3) The models which fit the data basically require eternal inflation. Ultimately, I see these kinds of arguments as the kind of thing that are based on a number of assumptions for which it's difficult to come to agreement. For example, Ijjas, Steinhardt, and Loeb argue that the production of eternal inflation strongly disfavors these models, but I would argue that eternal inflation would have a tendency to reduce some of the other problems they mention (such as the resulting inflation tending to be short). I'd really prefer to wait and see what future observations produce, rather than trying to draw any firm conclusions here. To me, the Planck results are exciting because, for the very first time, they're starting to put some limits on inflation. Unfortunately those results are not precise enough to make those limits very strong, so we can't say much definitively. We really need better observations, particularly of the CMB polarization. [/QUOTE]
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Astronomy and Cosmology
Cosmology
Current Status of Eternal Inflation
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