Abstract
Flavor transitions of Neutrinos with a nonstandard interaction are studied. A scalar field is conformally coupled to matter and neutrinos. This interaction alters the neutrino effective mass and its wavefunction leading to a damping factor, causing deficits in the probability densities and affecting the oscillation phase. As the matter density determines the scalar field's behavior, we also have an indirect matter density effect on the flavor conversion. We explain our results in the context of screening models and study the deficit in the total flux of electron-neutrinos produced in the Sun through the decay process and confront our results with observational data.
Highlights
One of the most interesting subjects in particle physics and cosmology is the physics of neutrinos, which has received a lot of attention, especially in the beyond standard model theories
We have studied a scenario about damped neutrino oscillations in a curved spacetime, which consists of a scalar field conformally coupled to other ingredients such as matter and neutrinos [see Eq (2)]
To derive the oscillation probabilities, we studied the behavior of the Dirac equation under the conformal transformation, which reduces the model into the flat spacetime with a rescaled wave function and a coordinate dependent mass [see Eqs. (14) and (15)]
Summary
One of the most interesting subjects in particle physics and cosmology is the physics of neutrinos, which has received a lot of attention, especially in the beyond standard model theories. The interaction with the scalar field by modifying the neutrino effective mass and its density provides a mixed situation [37] in which the neutrino deficit may be related to both the neutrino oscillation and neutrino decay. Such neutrino decay models as a second-order effect behind the solar neutrino problem can better fit solar neutrino data [38], which can constrain the lifetime (τ2) of the neutrino mass eigenstate ν2. Throughout this paper we use the units ħ 1⁄4 c 1⁄4 kB 1⁄4 8πG 1⁄4 1 and the metric signature ð−; þ; þ; þÞ
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