Probing reheating via direct detection of the inflationary gravitational wave background and its implications for dark matter candidate

Abstract

Future direct detection gravitational wave experiments would provide vital information on the early Universe. It may enable us to determine the reheating temperature by detecting a signature of reheating on the spectrum of the inflationary gravitational wave background. We investigate the detectability of the reheating signature and discuss its implications for particle physics, especially on the scenario where gravitinos are dark matter candidates.