Leptogenesis, gravitino dark matter, and entropy production

Jasper Hasenkamp and Jörn Kersten
Phys. Rev. D 82, 115029 – Published 29 December 2010

Abstract

Many extensions of the standard model predict superweakly interacting particles, which typically have to decay before big bang nucleosynthesis. The entropy produced in the decays may help to reconcile thermal leptogenesis and big bang nucleosynthesis in scenarios with gravitino dark matter, which is usually difficult due to late decays of the next-to-lightest supersymmetric particle spoiling the predictions of big bang nucleosynthesis. We study this possibility for a general neutralino next-to-lightest supersymmetric particle. We elaborate general properties of the scenario and strong constraints on the entropy-producing particle. As an example, we consider the saxion from the axion multiplet and show that, while enabling a solution of the strong CP problem, it can also produce a suitable amount of entropy.

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  • Received 14 October 2010

DOI:https://doi.org/10.1103/PhysRevD.82.115029

© 2010 The American Physical Society

Authors & Affiliations

Jasper Hasenkamp* and Jörn Kersten

  • II. Institute for Theoretical Physics, University of Hamburg, Germany

  • *Jasper.Hasenkamp@desy.de
  • Joern.Kersten@desy.de

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Issue

Vol. 82, Iss. 11 — 1 December 2010

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