Dark Radiation in LARGE Volume Models
High Energy Physics - Phenomenology
2013-03-14 v2 Cosmology and Nongalactic Astrophysics
High Energy Physics - Theory
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.
Cite
@article{arxiv.1208.3562,
title = {Dark Radiation in LARGE Volume Models},
author = {Michele Cicoli and Joseph P. Conlon and Fernando Quevedo},
journal= {arXiv preprint arXiv:1208.3562},
year = {2013}
}
Comments
6 pages; v2. refs updated