Journal of High Energy Physics

, 2012:125

Dark radiation and dark matter in large volume compactifications

Authors

    • Mathematical Physics Lab., RIKEN Nishina Center
  • Fuminobu Takahashi
    • Department of PhysicsTohoku University
Article

DOI: 10.1007/JHEP11(2012)125

Cite this article as:
Higaki, T. & Takahashi, F. J. High Energ. Phys. (2012) 2012: 125. doi:10.1007/JHEP11(2012)125

Abstract

We argue that dark radiation is naturally generated from the decay of the overall volume modulus in the LARGE volume scenario. We consider both sequestered and non-sequestered cases, and find that the axionic superpartner of the modulus is produced by the modulus decay and it can account for the dark radiation suggested by observations, while the modulus decay through the Giudice-Masiero term gives the dominant contribution to the total decay rate. In the sequestered case, the lightest supersymmetric particles produced by the modulus decay can naturally account for the observed dark matter density. In the non-sequestered case, on the other hand, the supersymmetric particles are not produced by the modulus decay, since the soft masses are of order the heavy gravitino mass. The QCD axion will then be a plausible dark matter candidate.

Keywords

Supersymmetry Phenomenology Strings and branes phenomenology

Copyright information

© SISSA, Trieste, Italy 2012