Warm dark matter in low scale leftright theory
Abstract
We investigate the viability of having dark matter in the minimal leftright symmetric theory. We find the lightest righthanded neutrino with a mass around keV as the only viable candidate consistent with a TeV scale of leftright symmetry. In order to account for the correct relic density with such low scales, the thermal overproduction of the dark matter in the early universe is compensated by a sufficient late entropy production due to late decay of heavier righthanded neutrinos. We point out that the presence of the righthanded chargecurrent interactions, operative around the QCD phase transition, has a crucial impact on the amount of dilution, as does the nature of the phase transition itself. A careful numerical study, employing the Boltzmann equations, reveals the existence of a narrow window for the righthanded gauge boson mass, possibly within the reach of LHC (in disagreement with a previous study). We also elaborate on a variety of astrophysical, cosmological and low energy constraints on this scenario.
 Publication:

Journal of Cosmology and Astroparticle Physics
 Pub Date:
 July 2012
 DOI:
 10.1088/14757516/2012/07/006
 arXiv:
 arXiv:1205.0844
 Bibcode:
 2012JCAP...07..006N
 Keywords:

 High Energy Physics  Phenomenology;
 Astrophysics  Cosmology and Nongalactic Astrophysics;
 High Energy Physics  Experiment
 EPrint:
 32 pages, 7 figures