Year: 2018
Type: article
Abstract: If dark energy (DE) is a dynamical field rather than a cosmological constant, an interaction between DE and the neutrino sector could exist, modifying the neutrino oscillation phenomenology and causing $CP$ and apparent Lorentz violating effects. The terms in the Hamiltonian for flavor propagation induced by the DE-neutrino coupling do not depend on the neutrino energy, while the ordinary components decrease as $\mathrm{\ensuremath{\Delta}}{m}^{2}/{E}_{\ensuremath{\nu}}$. Therefore, the DE-induced effects are absent at lower neutrino energies, but become significant at higher energies, allowing to be searched for by neutrino observatories. We explore the impact of the DE-neutrino coupling on the oscillation probability and the flavor transition in the three-flavor framework, and investigate the $CP$-violating and apparent Lorentz violating effects. We find that DE-induced effects become observable for ${E}_{\ensuremath{\nu}}{m}_{\mathrm{eff}}\ensuremath{\sim}{10}^{\ensuremath{-}20}\text{ }\text{ }{\mathrm{GeV}}^{2}$, where ${m}_{\mathrm{eff}}$ is the effective mass parameter in the DE-induced oscillation probability, and $CP$ is violated over a wide energy range. We also show that current and future experiments have the sensitivity to detect anomalous effects induced by a DE-neutrino coupling and probe the new mixing parameters. The DE-induced effects on neutrino oscillation can be distinguished from other new physics possibilities with similar effects, through the detection of the directional dependence of the interaction, which is specific to this interaction with DE. However, current experiments will not yet be able to measure the small changes of $\ensuremath{\sim}0.03%$ in the flavor composition due to this directional effect.
Authors: Niki Klop, Shin’ichiro Ando
Language: English
Topic: Neutrino Physics Research
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W2774018558