Obtaining some constraints on the early universe based on WMAP-9 and Planck by using DECIGO and BBO detectors

摘要

The evolution stages of the universe such as: inflation, reheating, radiation, matter and acceleration can affect on the shape of the spectrum of relic gravitational waves. As well known, at the end of inflation, the scalar field phi oscillates quickly around some point where potential V(phi) = lambda phi(n) has a minimum. The potential V causes that the scale factor S obtains unusual growth during inflation, as the amount of this growth is given by e(N), where N is the e-folding number. On the other hand the behaviour of the inflation and reheating stages are often known as power law expansion like S(eta) alpha eta(1+beta),S(eta) alpha eta(1+beta s), respectively. The eta is conformal time and beta, beta(s) constrained on the 1 + beta 0 and 1 + beta(s) 0. The waves being used to determine the reheating temperature in the range (10(6)-10(9)) GeV based on the BBO and DECIGO detectors. Hence we found constraints on the parameters N, beta, beta(s) and n corresponding to the range of reheating temperature, WMAP-9 and Planck. As these constraints give us valuable information about the manner of the evolution of universe and the waves during inflation and reheating stages. (C) 2018 Elsevier B.V. All rights reserved.