Neutrino flavor oscillations inside matter in conformal coupling models

Abstract

We recently studied neutrinos flavor oscillations in vacuum within conformal coupling models. In this paper, we extend that analysis by investigating neutrino flavor oscillations inside matter within a general conformal coupling scenario. We first derive the general formula for the flavor transition probability inside matter in arbitrary static and spherically symmetric spacetimes. The modified resonance formula of the MSW effect is derived and the corresponding adiabaticity parameter of the effect is extracted. An application of our results to the case of two-flavor neutrinos within the well-known chameleon and symmetron conformal coupling models is made.

Comments: 12 pages. No figures. One reference added. Section II (summarizing the vacuum oscillations) in this article draws heavily from arXiv:2209.03899, where vacuum oscillations in screening models have been worked out in much more detail. Matches the published version