Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-12-21
Phys.Rev.Lett.107:061301,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, 5 figures. Accepted for publication in PRL with minor changes
Scientific paper
10.1103/PhysRevLett.107.061301
We show that quantum effects dramatically enhance the production of fermions following preheating after inflation in the early Universe in the presence of high excitations of bosonic quanta. As a consequence fermions rapidly approach a quasistationary distribution with a thermal occupancy in the infrared, while the inflaton enters a turbulent scaling regime. The failure of standard semiclassical descriptions based on the Dirac equation with a homogeneous background field is caused by nonperturbatively high boson occupation numbers. During preheating the inflaton occupation number increases, thus leading to a dynamical mechanism for the enhanced production of fermions from the rescattering of the inflaton quanta. We comment on related phenomena in heavy-ion collisions for the production of quark matter fields from highly occupied gauge bosons.
Berges Juergen
Gelfand D.
Pruschke J.
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