Warm Dark Matter in Low Scale Left-Right TheoryReport as inadecuate



 Warm Dark Matter in Low Scale Left-Right Theory


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We investigate the viability of having dark matter in the minimal left-right symmetric theory. We find the lightest right-handed neutrino with a mass around keV as the only viable candidate consistent with a TeV scale of left-right 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 right-handed neutrinos. We point out that the presence of the right-handed charge-current 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 right-handed 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.



Author: Miha Nemevsek; Goran Senjanovic; Yue Zhang

Source: https://archive.org/







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