Quantum Seesaw Cosmology: A Heating Phase from Pauli Blocking
Nicolás Bernal, Chee Sheng Fong
Abstract
In Seesaw Cosmology, a scalar field reheats the Standard Model (SM) through right-handed neutrinos (RHNs), which generate tiny neutrino masses through the seesaw mechanism. When RHNs rapidly fill a restricted momentum-space region, expansion continually opens new fermionic states that are refilled by subsequent scalar decays, maintaining an approximately constant physical RHN density. This gives rise to a novel heating regime in which the SM temperature increases with the scale factor as T a+3/8, in sharp contrast to the conventional T a-3/8 scaling during matter-dominated reheating.
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