Gravitational waves and neutrino oscillations in Chern-Simons axion gravity

Abstract

We investigate the modifications in the neutrino flavor oscillations under the influence of a stochastic gravitational wave background (SGWB), in a scenario in which General Relativity is modified by an additional Chern-Simons (CS) term. Assuming that the dark matter halo is in the form of axions, the CS coupling modifies the pattern of the neutrino flavor oscillations at Earth up to a total suppression in some frequency range. At the same time, the SGWB in the halo could stimulate the axion decay into gravitons over a narrow frequency range, leading to a potentially detectable resonance peak in the enhanced SGWB strain. A consistent picture would require these features to potentially show up in neutrino detection from supernovae, gravitational wave detectors, and experiments aimed at the search for axions in the Milky Way halo.

Searching for dark matter axions with Berry phase

“…they could explain the small-scale structures in the cold DM Universe [16][17][18][19]), and are one of the most promising DM candidates. For these reasons, experimental searches or proposals for detecting axions or ALPs are urgent and several suggestions have been made in the literature based for example, on (1) their coupling to the electromagnetic fields, which includes the conversion of ALPs into photons [20][21][22][23], the spectral distortion of photons [24][25][26][27][28][29], a fifth force mediated by ALPs [30][31][32] and cosmological bounds [33] (these experiments have excluded part of the parameter space P of the ALPs [34]); (2) the birefringence effect (the axion field can give rise to a rotation of the photon polarization angle due to the interaction with the electromagnetic field) [35][36][37][38][39][40][41][42][43][44][45][46]; (3) resonance effects in Josephson junctions [69], quantum squeezing technology [71] (see [34,72] and references therein); (4) spin-axion coupling [61]; gravitational waves [62,63].…”