ELKO as dark matter candidate

Bakul Agarwal, Alekha C. Nayak, Ravindra K. Verma, Pankaj Jain

Published 2014-07-03, updated 2015-02-06Version 3

We study the implications of the ELKO fermions as a dark matter candidate. Such fermions arise in theories that are not symmetric under the full Lorentz group. Although they do not carry electric charge, ELKOs can couple to photons through a non-standard interaction. They also couple to Higgs but do not couple to other standard model particles. We impose limits on their coupling strength and the ELKO mass assuming that these particles give dominant contribution to the cosmological cold dark matter.