Diffuse Axion Background
Joshua Eby, Volodymyr Takhistov

TL;DR
This paper develops a framework for the diffuse axion background from transient astrophysical sources, constrains its flux using existing data, and discusses future detection prospects across a wide axion mass range.
Contribution
It introduces a general framework for the diffuse axion background from transient sources and derives constraints from existing observations, highlighting future experimental sensitivities.
Findings
Strong constraints on light axion flux from existing gamma-ray and X-ray data.
Future experiments will significantly improve sensitivity to the diffuse axion background.
D$a$B can serve as a probe for axion emission sources and mechanisms.
Abstract
Relativistic axions can be readily produced in a broad variety of transient sources, such as axion star bosenova explosions, supernovae or even evaporating primordial black holes. We develop a general framework describing the resulting persistent diffuse axion background (DB) due to accumulated axions from historic transient events. We derive strong constraints on the DB flux from light axions emitted from sources with energies considering the non-observation of excess photons associated with axion-photon coupling from experiments, including COMPTEL, NuSTAR, XMM-Newton, INTEGRAL, EGRET and Fermi. Future searches in experiments such as SKA, JWST, XRISM, Vera C. Rubin Observatory, AMEGO/e-ASTROGAM will allow probing DB and associated axion-photon couplings with unprecedented sensitivity covering a wide range of possible…
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Taxonomy
TopicsDark Matter and Cosmic Phenomena · Cosmology and Gravitation Theories · Black Holes and Theoretical Physics
