The impact of excited neutrinos on $\nu \bar{\nu }\to \gamma \gamma$ process

Abstract

We examine the effect of excited neutrinos on the annihilation of relic neutrinos with ultra high energy cosmic neutrinos for the $\nu \bar{\nu }\to \gamma \gamma$ process. The contribution of the excited neutrinos to the neutrino-photon decoupling temperature are calculated. We see that photon-neutrino decoupling temperature can be significantly reduced below the obtained value of the Standard Model with the impact of excited neutrinos.

Comments: 11 pages, 3 figures, published version