If the tensor-to-scalar ratio r of cosmological perturbations takes a large value r∼0.1, which may be inferred from the recent BICEP2 result, we can hope to determine thermal history, in particular, the reheating temperature, TR, after inflation by space-based laser interferometers. It is shown that upgraded and upshifted versions of DECIGO may be able to determine TR if it lies in the range 6×106<TR <5×107GeV and 3×107<TR<2×108GeV, respectively. Although these ranges include predictions of some currently plausible inflation models, because each specification can probe TR of a range of at most a decade, we should determine the specifications of DECIGO taking full account of the constraints on inflation models to be obtained by near-future observations of temperature anisotropy and B-model polarization of the cosmic microwave background radiation.
|Journal||Progress of Theoretical and Experimental Physics|
|Publication status||Published - 2014 Oct 10|
ASJC Scopus subject areas
- Physics and Astronomy(all)