Prospects of determination of reheating temperature after inflation by DECIGO

2014/10/31 by Sachiko Kuroyanagi, Kazunori Nakayama, Jun'ichi Yokoyama · 2 citations
Physics and Astronomy · #astro-ph.CO #gr-qc #hep-ph #hep-th

paper · pdf · doi:10.1093/ptep/ptu176

published as Prog. Theor. Exp. Phys. (2015) 013E02 · 12 pages, 14 figures; minor corrections to match published version

arxiv created 2014/12/11 · arxiv updated 2015/02/23

Abstract

If the tensor-to-scalar ratio r of cosmological perturbations takes a large value r∼ 0.1, which may be inferred by recent BICEP2 result, we can hope to determine thermal history, in particular, the reheating temperature, T_R, after inflation by space-based laser interferometers. It is shown that upgraded and upshifted versions of DECIGO may be able to determine T_R if it lies in the range 6× 10⁶< T_R < 5× 10⁷GeV and 3× 10⁷<T_R<2× 10⁸GeV, respectively. Although these ranges include predictions of some currently plausible inflation models, since each specification can probe T_R of at most a decade range, we should determine the specifications of DECIGO with full account of constraints on inflation models to be obtained by near-future observations of temperature anisotropy and B-model polarization of the cosmic microwave background radiation.

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