Dark radiation from the axino solution of the gravitino problem

Details Dark radiation from the axino solution of the gravitino problem Dark radiation from the axino solution of the gravitino problem

2011-07-21

arxiv.org/abs/1107.4319v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 p. + refs, 1 figure; v2: refs added, presentation improved, matches published version

Scientific paper

Current observations of the cosmic microwave background could confirm an increase in the radiation energy density after primordial nucleosynthesis but before photon decoupling. We show that, if the gravitino problem is solved by a light axino, dark (decoupled) radiation emerges naturally in this period leading to a new upper bound on the reheating temperature T_R < 10^{11} GeV. In turn, successful thermal leptogenesis might predict such an increase. The Large Hadron Collider could endorse this opportunity. At the same time, axion and axino can naturally form the observed dark matter.

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