Speaker
Description
Gamma-ray bursts (GRBs) are cataclysmic astrophysical events, classified into long-duration (lasting ≥ 2 seconds) and short-duration bursts. We investigated two subcategories of GRBs: choked and low-luminosity (LL) GRBs, focusing on their potential to emit high-energy neutrinos. Our analytical approach incorporates pion and kaon decay mechanisms, taking into account cooling effects such as synchrotron and hadronic cooling. For choked GRBs, we found that the neutrino flux is dominated by kaon decay, due to kaons' heavier mass and shorter decay time compared to pions. We found that p-p mechanism produces lower neutrino fluxes compared to the Ice-Cube detected diffuse neutrino flux. Our model parameters are informed by simulation results for choked GRBs, and fine-tuning these parameters or considering distinct scenarios for hidden jets could potentially explain the observed neutrino flux.
In the case of LL GRBs, our calculations suggest that their contribution to the diffuse neutrino background is significant at high energies. Notably, the results for LL GRBs are highly sensitive to variations in GRB parameters, which can significantly influence the neutrino flux. As neutrino detectors such as IceCube, ANTARES, and KM3NeT gather more data, the potential to refine theoretical models and place constraints on neutrino production mechanisms in astrophysical sources becomes increasingly promising. The upcoming IceCube-Gen2 observatory will be instrumental in identifying individual neutrino sources.
| Field of contribution | Theory |
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