Neutrino Transition in Dark Matter

TL;DR

This paper explores how ultralight dark matter could influence neutrino oscillations through a previously unexamined medium effect, providing a new formula for transition probabilities and constraining model parameters.

Contribution

It introduces a novel first-order medium effect in neutrino transitions due to dark matter, deriving a general transition probability formula that extends standard oscillation models.

Findings

New medium effect constrains dark matter-neutrino interaction models

Derived a comprehensive formula for neutrino transition probabilities

Identified implications for neutrino physics in dark matter environments

Abstract

An ultralight dark matter may have interesting implications in neutrino physics which have been studied actively in recent years. It is pointed out that there appears yet unexplored medium effect in neutrino transitions which occurs at the first order in perturbation of the neutrino-medium interaction. We derive the general formula for the neutrino transition probability in a medium which describes the standard neutrino oscillation as well as the new medium contribution. It turns out that such an effect constrains the model parameter space more than ever.