Speaker
Description
There is an increasing interest in the interplay between Open Quantum Systems and Inflationary Physics. A time-dependent background and limited access to the degrees of freedom invite the use of Open Quantum systems. It provides a more general framework than the unitary time evolution of a free state. In this talk, based on 2404.15416 and 2507.03103, we develop a local EFT for the scalar curvature perturbations subject to the dynamics of an open quantum system. We recover the scale-invariant power spectrum and then move on to the bispectrum. We study its amplitude and shape as a function of dissipation and other EFT parameters. Our results largely generalise the setup of warm inflation to general non-equilibrium cases. Finally, I will discuss the search for dissipative dynamics in the CMB bispectrum and the current constraints on the dissipation scale.