Comment on astrophysical consequences of a neutrinophilic 2HDM

Details Comment on astrophysical consequences of a neutrinophilic 2HDM Comment on astrophysical consequences of a neutrinophilic 2HDM

2011-06-20

arxiv.org/abs/1106.3880v2

Phys.Rev.D84:038701,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

2 pages, no figures; minor changes, accepted for publication in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.84.038701

Several authors have pointed out that the scalar-mediated interaction of neutrinos in a neutriophilic two-Higgs-doublet model (nu2HDM) can be as strong as electromagnetic interaction [1-3]. We show that the coupling constants of neutrino-scalar interaction are actually restricted to be y_i < 1.5 x 10^{-3} by supernova neutrino observation, and further constrained to be y_i < 2.3 x 10^{-4} by precision measurements of acoustic peaks of the cosmic microwave background. Based on the energy-loss argument for supernova cores, we derive a slightly more restrictive bound y_i < 3.5 x 10^{-5}. Therefore, the nu2HDM has lost its spirit of explaining tiny Dirac neutrino masses while keeping neutrino Yukawa couplings of order one.

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