Dark Radiation in LARGE Volume Models

2012/08/31 by Michele Cicoli, Joseph P. Conlon, Fernando Quevedo · 1 citation
Physics and Astronomy · #hep-ph #astro-ph.CO #hep-th

paper · pdf · doi:10.1103/physrevd.87.043520

6 pages; v2. refs updated

arxiv created 2012/09/21 · arxiv updated 2013/03/13

Abstract

We consider reheating driven by volume modulus decays in the LARGE Volume Scenario. Such reheating always generates non-zero dark radiation through the decays to the axion partner, while the only competitive visible sector decays are Higgs pairs via the Giudice-Masiero term. In the framework of sequestered models where the cosmological moduli problem is absent, the simplest model with a shift-symmetric Higgs sector generates 1.56 < N_eff - N_eff,SM < 1.74. For more general cases, the known experimental bounds on N_eff strongly constrain the parameters and matter content of the models.

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