21-26 July 2014
Renold Building
Europe/London timezone
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Neutrino as dark matter under $U(1)_X$

Presented by Dr. Wei-Chih HUANG on 22 Jul 2014 from 15:10 to 15:30
Type: Particle Cosmology
Track: Particle Cosmology


We augment the standard model gauge groups by an additional $U(1)_X$ group with the corresponding gauge boson, $Z^\prime$, in the context of the type-I seesaw. After breaking $U(1)_X$ with vacuum expectation values of even charge, the lightest of particles, one of the heavy neutrinos, with odd $U(1)_X $ charge is a dark matter candidate. We first find the minimum anomaly-free particle content and then discuss the light neutrino mass spectrum and mixing matrix, which in this model consists of radiative corrections and tree-level contributions from the right-handed neutrinos. Second, in terms of the relic density, we investigate the interplay between annihilation processes via the $Z^\prime$ exchange and co-annihilation processes, including experimental constraints, and reproducing the observed neutrino mixing angles and mass-squared differences.


Location: Renold
Room: F14

Primary authors