Non-thermal leptogenesis with almost degenerate superheavy neutrinos

Details Non-thermal leptogenesis with almost degenerate superheavy neutrinos Non-thermal leptogenesis with almost degenerate superheavy neutrinos

2002-08-29

arxiv.org/abs/hep-ph/0208268v3

Phys.Rev. D67 (2003) 023509

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 revtex pages, 2 figure (uses axodraw). The derivation of the asymmetry parameter for the general case and one figure added.

Scientific paper

10.1103/PhysRevD.67.023509

We present a model with minimal assumptions for non-thermal leptogenesis with almost degenerate superheavy right-handed neutrinos in a supersymmetric set up. In this scenario a gauge singlet inflaton is directly coupled to the right-handed (s)neutrinos with a mass heavier than the inflaton mass. This helps avoiding potential problems which can naturally arise otherwise. The inflaton decay to the Standard Model leptons and Higgs, via off-shell right-handed (s)neutrinos, reheats the Universe. The same channel is also responsible for generating the lepton asymmetry, thus requiring no stage of preheating in order to excite superheavy (s)neutrinos. The suppressed decay rate of the inflaton naturally leads to a sufficiently low reheat temperature, which in addition, prevents any wash out of the yielded asymmetry. We will particularly elaborate on important differences from leptogenesis with on-shell (s)neutrinos. It is shown that for nearly degenerate neutrinos a successful leptogenesis can be accommodated for a variety of inflationary models with a rather wide ranging inflationary scale.

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