Adiabatic out-of-equilibrium solutions to the Boltzmann equation in warm inflation Bastero Gil, Mar Berera, Arjun Ramos, Rudnei O. Rosa, João G. Cosmology of Theories beyond the SM Thermal Field Theory We show that, in warm inflation, the nearly constant Hubble rate and temperature lead to an adiabatic evolution of the number density of particles interacting with the thermal bath, even if thermal equilibrium cannot be maintained. In this case, the number density is suppressed compared to the equilibrium value but the associated phase-space distribution retains approximately an equilibrium form, with a smaller amplitude and a slightly smaller effective temperature. As an application, we explicitly construct a baryogenesis mechanism during warm inflation based on the out-of-equilibrium decay of particles in such an adiabatically evolving state. We show that this generically leads to small baryon isocurvature perturbations, within the bounds set by the Planck satellite. These are correlated with the main adiabatic curvature perturbations but exhibit a distinct spectral index, which may constitute a smoking gun for baryogenesis during warm inflation. Finally, we discuss the prospects for other applications of adiabatically evolving out-of-equilibrium states. 2018-03-01T08:27:49Z 2018-03-01T08:27:49Z 2018-02-09 info:eu-repo/semantics/article Bastero Gil, M.; et al. Adiabatic out-of-equilibrium solutions to the Boltzmann equation in warm inflation. Journal of High Energy Physics, 2: 063 (2018). [http://hdl.handle.net/10481/49759] 1029-8479 http://hdl.handle.net/10481/49759 10.1007/JHEP02(2018)063 eng http://creativecommons.org/licenses/by-nc-nd/3.0/ info:eu-repo/semantics/openAccess Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License Springer