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May 8 – 10, 2023
University of Pittsburgh
US/Eastern timezone

Search for sub-MeV axion-like particles from horizontal branch stars

May 9, 2023, 2:00 PM
15m
Lawrence Hall 207

Lawrence Hall 207

Axion and ALP Axion II

Speaker

Takuya Okawa

Description

Axion-like particles (ALPs) coupled to photons are produced inside stars via the Primakoff process and photon coalescence. They spontaneously decay into two gamma-ray photons that escape from the stellar interior only if decays occur outside the photosphere. Owing to their hot and dense plasma and small radius of the photosphere, horizontal branch stars are promising astrophysical objects to detect the gamma-ray flux from ALP decays. We estimate the detectability of the ALP-induced gamma-ray flux at future MeV gamma-ray telescopes such as AMEGO-X and APT.

Primary author

Co-authors

Bhupal Dev (Washington University in St. Louis) Francesc Ferrer (Washington University in St Louis)

Presentation materials