The pattern of neutrino flavor oscillations could be altered by the influence of noisy perturbations such as those arising from a gravitational wave background (GWB). A stochastic process that is consistent with a GWB has been recently reported by the independent analyses of pulsar timing array (PTA) datasets collected over a decadal timescale by the North American Nanohertz Observatory for gravitational waves, the European PTA jointly with the Indian Pulsar Timing Array, the Parkes PTA, and the Chinese PTA collaborations. We investigate the modifications in the neutrino flavor oscillations under the influence of the GWB reported by the PTA collaborations and we discuss how such effects could be potentially revealed in near-future neutrino detectors, possibly helping the discrimination of different models for the GWB below the nHz frequency range.

• Received 7 July 2023
• Accepted 29 November 2023

DOI:https://doi.org/10.1103/PhysRevD.108.123028