Speaker
Description
The Diffuse Supernova Neutrino Background (DSNB) constitutes a steady and isotropic flux of neutrinos originating from all past core-collapse supernovae across the observable universe. Despite decades of theoretical development and increasingly stringent limits from experiments such as Super-Kamiokande, the DSNB remains undetected. Its eventual observation would provide a unique probe of supernova dynamics and neutrino properties over cosmological distances, while a continued absence of signal may indicate physics beyond the Standard Model.
In this talk, we investigate the impact of secret neutrino interactions ($\nu$SI), or non-standard neutrino self-interactions, on the DSNB flux. Such interactions are well motivated by scenarios of neutrino mass generation, including models with light mediators such as the Majoron, and can be significantly stronger than Standard Model interactions. While laboratory tests of $\nu$SI are challenging due to limited neutrino fluxes, astrophysical environments and long-baseline propagation offer a natural setting to probe these effects.
We focus on the attenuation of DSNB neutrinos due to scattering with the cosmic neutrino background in the presence of $\nu$SI. In particular, we explore the possibility of resonant enhancement in the case where one relic neutrino remains relativistic, leading to distinctive distortions in the DSNB energy spectrum. We present the resulting spectral modifications and assess their detectability at current and upcoming neutrino observatories, including Jiangmen Underground Neutrino Observatory, Hyper-Kamiokande, and Deep Underground Neutrino Experiment. These results demonstrate the potential of DSNB measurements as a sensitive probe of new neutrino interactions beyond the Standard Model.
| Other topic / keywords: | Supernova physics |
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