Opening remarks
In this work, we systematically study gravitational wave (GW) production during both the inflationary and post-inflationary epochs. While inflationary GWs can be readily derived from tensor perturbations during inflation, post-inflationary GWs arise from a variety of processes during reheating and require detailed treatment for quantitative analysis. We consider four distinct production...
Gravitational waves are useful probe for the physics of the early Universe. I will discuss several sources of stochastic gravitational wave background from the early Universe and provide a historical overview of this fascinating research field.
