skip to main content

SciTech ConnectSciTech Connect

Title: Correlation between dark matter and dark radiation in string compactifications

Reheating in string compactifications is generically driven by the decay of the lightest modulus which produces Standard Model particles, dark matter and light hidden sector degrees of freedom that behave as dark radiation. This common origin allows us to find an interesting correlation between dark matter and dark radiation. By combining present upper bounds on the effective number of neutrino species N{sub eff} with lower bounds on the reheating temperature as a function of the dark matter mass m{sub DM} from Fermi data, we obtain strong constraints on the (N{sub eff}, m{sub DM})-plane. Most of the allowed region in this plane corresponds to non-thermal scenarios with Higgsino-like dark matter. Thermal dark matter can be allowed only if N{sub eff} tends to its Standard Model value. We show that the above situation is realised in models with perturbative moduli stabilisation where the production of dark radiation is unavoidable since bulk closed string axions remain light and do not get eaten up by anomalous U(1)s.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Department of Physics and Astronomy, University of New Mexico, 1919 Lomas Blvd NE, Albuquerque, NM 87131 (United States)
  2. Dipartimento di Fisica ed Astronomia, Università di Bologna, Via Irnerio 46, 40126 Bologna (Italy)
  3. Mitchell Institute for Fundamental Physics and Astronomy, Department of Physics and Astronomy, Texas A and M University, College Station, TX 77843-4242 (United States)
  4. Department of Physics, Syracuse University, Crouse Drive, Syracuse, NY 13244 (United States)
Publication Date:
OSTI Identifier:
22375852
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 10; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AXIONS; COMPACTIFICATION; CORRELATIONS; DECAY; DEGREES OF FREEDOM; MASS; NEUTRINOS; NONLUMINOUS MATTER; ORIGIN; STANDARD MODEL