Sommaire:

Perturbations in CMB photons and LSS of the Universe are sourced primarily by the curvature perturbation produced during inflation. I will present a study of a two-field inflationary model in which the inflaton couples to a spectator field. The one-loop interaction between the spectator and the inflaton induces a rapid growth of the momentum of the curvature perturbation and the associated Gaussian van Neumann entropy during inflation such that the state of the curvature perturbation at the end of inflation differs substantially from the standard one, in which the state is highly squeezed and the momentum is very suppressed. Consequently, one ought to reconsider the kinetic equations describing the evolution of the photon, dark matter, and baryonic fluids in radiation and matter eras by modelling the curvature perturbation and its canonical momentum as two a priori independent stochastic fields. If time permits, I will briefly analyze possible imprints on the CMB temperature fluctuations from the more general inflationary scenario which contains light spectator fields coupled to the inflaton by using a simplistic linear evolution in radiation and matter eras.

Pour plus d'informations, merci de contacter Alexandrov S.