Parity Violation and Chiral Oscillation of Cosmological Relic Neutrinos

TL;DR

This paper investigates how parity violation and chiral oscillations affect the detection of cosmological relic neutrinos, revealing a reduction in event rate compared to traditional models due to chiral oscillation effects.

Contribution

It introduces the impact of parity violation on neutrino oscillation, highlighting the significance of chiral oscillations in cosmological neutrino detection.

Findings

Event rate for relic neutrinos is halved due to chiral oscillations.

Parity violation leads to initial production of only left-chiral neutrinos.

Chiral oscillations significantly influence neutrino detection predictions.

Abstract

The conventional derivation of neutrino oscillation treats neutrino mass eigenstate as plane wave with an overall evolution phase. Nevertheless, due to the intrinsic parity-violating nature of weak interactions, only the left-chiral neutrino can be produced as initial condition. On the other hand, the neutrino mass term connects the left-chiral component to the right-chiral one and unavoidably leads to generation of the later through oscillation. This chiral oscillation has significant consequences on the detection of the cosmological relic neutrinos. The event rate is reduced by a factor of 2 than the conventional prediction.