Astrophysics > Cosmology and Nongalactic Astrophysics
[Submitted on 25 Mar 2015 (v1), last revised 6 Jul 2015 (this version, v3)]
Title:On the viability of m**2 phi**2 and natural inflation
View PDFAbstract:In the context of single field inflation, models with a quadratic potential and models with a natural potential with subplanckian decay constant are in tension with the Planck data. We show that, when embedded in a two-field model with an additional super massive field, they can become consistent with observations. Our results follow if the inflaton is the phase of a complex field (or an angular variable) protected by a mildly broken U(1) symmetry, and the radial component, whose mass is much greater than the Hubble scale, is stabilized at subplanckian values. The presence of the super massive field, besides modifying the effective single field potential, causes a reduction in the speed of sound of the inflaton fluctuations, which drives the prediction for the primordial spectrum towards the allowed experimental values. We discuss these effects also for the linear potential, and show that this model increases its agreement with data as well
Submission history
From: Vicente Atal [view email][v1] Wed, 25 Mar 2015 18:37:37 UTC (210 KB)
[v2] Thu, 26 Mar 2015 17:45:26 UTC (211 KB)
[v3] Mon, 6 Jul 2015 13:21:13 UTC (224 KB)
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