Relic Right-handed Dirac Neutrinos and Cosmic Neutrino Background

Abstract

The PTOLEMY experiment, implementing a 100 g surface-deposition tritium target, is promising to detect cosmic neutrino background via ν e + 3 H → 3 He + e − . In this talk, I consider a thermal production of right-handed Dirac neutrinos in the early Universe, and investigate their impact on the capture rate of cosmic relic neutrinos at PTOLEMY.