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γ rays from in-flight positron annihilation as a probe of new physics

Carenza, Pierluca; Mastrototaro, Leonardo; Balaji, Shyam +1 more

The γ-ray emission originating from in-flight annihilation (IA) of positrons is a powerful observable for constraining high-energy positron production from exotic sources. By comparing diffuse γ

X-ray polarimetric features of gamma-ray bursts across varied redshifts and hints for axionlike particles

Wang, Zhongxiang; Fang, Taotao; Huang, Feng +1 more

Polarimetric features during the prompt phase of gamma-ray bursts (GRBs) have been essential for elucidating the debated emission mechanisms and gaining insight into the inner structure of GRBs. However, the potential impact of photon-axionlike particle (ALP) mixing in extragalactic magnetic fields, leading to significant modifications to the init…