Dark matter interpretation of GRB 221009A: A singlet scalar explains LHAASO data

In this work, we propose a Dark Matter (DM) interpretation of the intensive gamma ray burst GRB 221009A. This indirect detection approach is devoted to the decay of DM particles into High Energy (HE) photons. In this context, a singlet scalar DM generated at the redshift of GRB 221009A is up-scattered by the High Energy Cosmic Rays (HECRs) during its propagation to Earth. This highly boosted DM then possesses a high flux and undergoes a dominant di-photon decay before reaching the detector. The Large High Altitude Air Shower Observatory (LHAASO) probes such energetic gamma rays, which has recorded a [Formula: see text]13[Formula: see text]TeV event for the aforementioned GRB.