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  • Letter
  • Open Access

New solar x-ray constraints on keV axionlike particles

Cyprien Beaufort1,*, Mar Bastero-Gil2,1,†, Tiffany Luce1,‡, and Daniel Santos1,§

  • 1Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, CNRS/IN2P3, 38000 Grenoble, France
  • 2Departamento de Física Teórica y del Cosmos, Universidad de Granada, Granada-18071, Spain

  • *cyprien.beaufort@lpsc.in2p3.fr
  • †mbg@ugr.es
  • ‡tiffany.luce@physik.uni-freiburg.de
  • §daniel.santos@lpsc.in2p3.fr

Phys. Rev. D 108, L081302 – Published 17 October, 2023

DOI: https://doi.org/10.1103/PhysRevD.108.L081302

Abstract

The decay of axionlike 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 (gaγγ,m) by considering ALPs production via photon coalescence. For gae≠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 gae. Out of the transitional region, the solar x-ray constraints on ALPs are exclusively governed by gaγγ.

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