Neutrino spin oscillations in conformally gravity coupling models and quintessence surrounding a black hole

TL;DR

This study investigates how conformally coupled scalar fields and quintessence around black holes influence neutrino spin oscillations, revealing suppression effects that could test modified gravity theories via neutrino observations.

Contribution

It introduces a model analyzing neutrino spin transitions in conformal gravity with screening effects and extends the analysis to quintessence fields near black holes, highlighting suppression of spin-flip probabilities.

Findings

Screening effects suppress neutrino spin-flip probability compared to General Relativity.

Suppression of neutrino flavor and spin transitions occurs in quintessence fields around black holes.

Potential for neutrino astronomy to test modified gravity and screening mechanisms.

Abstract

In this paper, we study the spin transitions of neutrinos caused by the interaction with a gravitational field. We consider a model with a scalar field (describing screening effects) conformally coupled to matter and neutrinos. The presence of screening effects suppresses the neutrino spin-flip probability as compared with General Relativity predictions. Such a result could be used, combined with neutrino astronomy, for testing modified theories of gravity and, in turn, screening effects invoked to bypass the solar system and Lab tests. Such an analysis has been also extended to the case of the quintessence field surrounding a black hole. Here we investigate the flavor and spin transitions, showing that also in such a case exists a suppression of the effect compared to General Relativity prediction.