The axion_photon interaction and gamma ray signals of dark matter

18th International Symposium on Particles Strings and Cosmology

Barranco, J.^1 ; Monteverde, A. Carrillo^1 ; Delepine, D.^1

División de Ciencias e Ingenierías, Universidad de Guanajuato, Campus León, C.P. 37150, León, Guanajuato, Mexico^1

关键词: Compact objects;    Conducting medium;    Gamma ray observatories;    Gamma ray signals;    Indirect methods;    Photon interactions;    Self annihilation;    Solar interior;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/485/1/012035/pdf
DOI  :  10.1088/1742-6596/485/1/012035

来源: IOP

【 摘 要 】

We explore two scenarios where the axion-photon interaction could induce additional astrophysical gamma ray signals for the dark matter. In the first scenario, dark compact objects made of axions, named axion stars, could collide with neutron stars. The whole energy of the axion star can be dissipated in the magnetized conducting medium of the neutron star generating gamma rays. The second scenario is an indirect method for observing self-annihilating dark matter trapped in stars: Gamma rays produced by the self-annihilation of neutralinos in the interior of the Sun can be transformed into axions due to photon-axion conversion. Then, the axion will travel freely in the Sun and be converted into photons again. This process is often referred as shine light through walls, in this case, the wall will be the solar interior. Hence, GeV gamma rays might pass through the Sun. We may conclude that observation of GeV photons by gamma-ray observatories like HAWC, coming from the Sun, may be a signal of annihilation of neutralinos in the interior of the Sun.