cosmic inflation

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Related to Inflationary models: Inflation theory

cosmic inflation

n.
The theory that the universe underwent a brief period of exponential expansion shortly after the Big Bang. Also called inflation theory.
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While the successes of inflationary models are unmistakable, IS&L nonetheless make the claim that inflation is untestable.
Alternatively, a weaker magnetic field can pass the non-Gaussianity constraints and allow the primordial tensor mode to be reduced, thus removing the tension with Planck data and alleviating the problems with simple inflationary models .
Not only is inflation continuing to look like a superb fit to the data," says Alan Guth, the MIT physicist who proposed inflation in 1981, "but it still looks like the simplest inflationary models are the ones that fit best.
He argues that the postulation of a Hawking-Penrose singularity suggested a beginning of the universe, but that this was mitigated by subsequent inflationary models that opened the possibility of out universe initially existing as one of a multiplicity of possible universes within a theoretical multiverse.
The simplest inflationary models predict that the scalar spectral index should be slightly less than 1, exactly as the WMAP team has found.
I will argue that oscillons can be produced in a large class of well-motivated inflationary models that are consistent with CMB anisotropy measurements.
Indeed, most inflationary models generate a region of uniformity many times bigger than the relatively small neighborhood of the universe we can observe today.
It seems to be a common feature of inflationary models in that whenever you produce one universe, you end up producing an infinite number of universes," he adds.
Proceeding that way, nevertheless, Page derives a model that gives the universe the proper expansion, including the inflationary period at the very beginning that is necessary to get the universe to the correct present size, and does it without the fine tuning of conditions required by some other inflationary models.
Thus, it is possible to see that, according the observational state-of-the-art presented in Section 2, non-gaussianity is more likely to be detected through the trispectrum than through the bispectrum, for the particular inflationary model studied in this paper, and from the WMAP, PLANCK, and even the 21 cm background anisotropies observations.