Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/24045
Title: Adiabatic out-of-equilibrium solutions to the Boltzmann equation in warm inflation
Author: Bastero-Gil, Mar
Berera, Arjun
Ramos, Rudnei O.
Rosa, João G.
Keywords: Warm inflation
Boltzmann equation
Baryogenesis
Issue Date: 24-Nov-2017
Publisher: Springer Verlag
Abstract: 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.
Peer review: yes
URI: http://hdl.handle.net/10773/24045
DOI: 10.1007/JHEP02(2018)063
ISSN: 1126-6708
Appears in Collections:CIDMA - Artigos

Files in This Item:
File Description SizeFormat 
Warm_Adiabatic.pdf549.61 kBAdobe PDFView/Open


FacebookTwitterDeliciousLinkedInDiggGoogle BookmarksMySpace
Formato BibTex MendeleyEndnote Degois 

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.