The effect of electromagnetic properties of neutrinos on the photon-neutrino decoupling temperature

TL;DR

This paper investigates how neutrinos' electromagnetic properties influence the photon-neutrino decoupling temperature, showing it can be significantly lowered below the QCD phase transition using an effective Lagrangian approach.

Contribution

It introduces a model-independent analysis of neutrino electromagnetic properties affecting the decoupling temperature beyond the standard model.

Findings

Photon-neutrino decoupling temperature can be reduced below the QCD phase transition.

Electromagnetic properties of neutrinos significantly impact relic neutrino annihilation.

Effective Lagrangian model provides a new way to analyze neutrino decoupling.

Abstract

We examine the impact of electromagnetic properties of neutrinos on the annihilation of relic neutrinos with ultra high energy cosmic neutrinos for the $\nu \bar{\nu}\to \gamma\gamma$ process. For this process, photon-neutrino decoupling temperature is calculated via effective lagrangian model beyond the standard model. We find that photon-neutrino decoupling temperature can be importantly reduced below the QCD phase transition with the model independent analysis defining electromagnetic properties of neutrinos.