Probing reheating with primordial spectrum

Abstract

We study the impacts of reheating temperature on the inflationary predictions of the spectral index and tensor-to-scalar ratio. Assuming sinusoidal oscillations and that reheating process is very fast, the reheating temperature can be constrained for sinusoidal oscillation within a factor of 10 - 100 or even better with the prospect of future observations. Beyond this, we find that the predictions can also be insensitive to the reheating temperature in certain models, including Higgs inflation.

(v1) 12 pages, 2 figures; (v2) references added; (v3) typos corrected, figures improved with Planck 2015 data, to appear in Journal of Cosmology and Astroparticle Physics

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• Multi-field formulation of gravitational particle production after inflation
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