We study stimulated emission and absorption of gravitons in a squeezed vacuum
state immersed in a thermal radiation bath. Employing one-loop
interaction-picture perturbation theory, we track the time evolution of the
graviton number operator and its expectation value in the squeezed vacuum,
which characterizes the inflationary graviton state. In a Minkowski background
with a thermal bath...
We present a minimal setup within the framework of Horndeski gravity that describes a nonpathological Genesis scenario. Our setup allows for a fully stable transition to the kination epoch, during which General Relativity (GR) is restored. This Genesis scenario circumvents the no-go theorem, albeit at the cost of encountering the risk of strong coupling in the past. Interestingly, our scenario...
