25–28 Sept 2012
DESY Hamburg
Europe/Berlin timezone

Dark radiation from the axino solution of the gravitino problem

27 Sept 2012, 18:20
20m
Seminar room 2 (DESY)

Seminar room 2

DESY

Cosmology & Astroparticle Physics Parallel Session 2: Cosmology & Astroparticle Physics

Speaker

Dr Jasper Hasenkamp (Hamburg U.)

Description

Current CMB observations could confirm an increase of the effective neutrino degrees of freedom at photon decoupling. We show that, if the gravitino problem is solved by a light axino, dark (decoupled) radiation emerges naturally after nucleosynthesis but before CMB times leading to a new upper bound on the reheating temperature < 10^10 GeV. In turn, successful thermal leptogenesis predicts such an increase. The LHC might endorse this opportunity. We identify several consistent cosmologies.

Primary author

Dr Jasper Hasenkamp (Hamburg U.)

Presentation materials