We reconsider thermal production of gravitinos in the early universe, adding to previously considered 2 -> 2 gauge scatterings: (a) production via 1 -> 2 decays, allowed by thermal masses: this is the main new effect, (b) the effect of the top Yukawa coupling, and (c) a proper treatment of the reheating process. Our final result behaves physically (larger couplings give a larger rate) and is twice larger than previous results, implying e.g. a constraint on the reheating temperature that is twice as strong. Accessory results about (supersymmetric) theories at finite temperature and gravitino couplings might have some pertinence.
|Autori:||Rychkov VS; Strumia A|
|Titolo:||Thermal production of gravitinos|
|Anno del prodotto:||2007|
|Digital Object Identifier (DOI):||10.1103/PhysRevD.75.075011|
|Appare nelle tipologie:||1.1 Articolo in rivista|