New solar X-ray constraints on keV Axion-Like Particles

2023/03/13 by C. Beaufort, Mar Bastero-Gil, Beaufort, Cyprien +5
Physics and Astronomy · #Atomic and Subatomic Physics Research #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Quantum, superfluid, helium dynamics #Solar and Stellar Astrophysics (astro-ph.SR)

paper · pdf · doi:10.48550/arxiv.2303.06968

openalex publication_date 2023/03/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The decay of Axion-Like Particles (ALPs) trapped in the solar gravitational field would contribute to the observed solar X-ray flux, hence constraining ALP models. We improve by one order of magnitude the existing limits in the parameter space (g_aγγ, m) by considering ALPs production via photon coalescence. For g_ae ≠ 0, we demonstrate that trapped ALPs can be Compton-absorbed while crossing the Sun, resulting in two regimes in the exclusion limits, with a transition triggered by g_ae. Out of the transitional region, the solar X-ray constraints on ALPs are exclusively governed by g_aγγ.

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