While the successes of inflationary models
are unmistakable, IS&L nonetheless make the claim that inflation is untestable.
2008) and in that time, it sparked some interest in the study of inflationary models
with vector fields.
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.
Key words: Primordial curvature perturbation, non-gaussianity, slow-roll inflationary models
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.