Axions are hypothetical particles beyond Standard Model that were first proposed to solve the strong CP problem in QCD. Axions are one of the well-motivated candidates for dark matter since Light Axions are stable on cosmic time scale and provide solutions for some astrophysical and cosmological issues. Interaction of Axions with Standard Model particles is the basis of their detection specially when they are coupled with Photons. The interaction of these particles with Photons is weak, but in presence of a strong magnetic field of Pulsar could be enhanced. In this thesis, we first review properties of Pulsars and also electric charges and electromagnetic field distribution around them. There might be an Axion field distribution around pulsar, so we explore its configuration, beside that we eva‎luate its effect on the distribution of the fields around the star. The existence of Axion clouds around the pulsar changes the optical properties of its electromagnetic radiations. We then eva‎luate the effect of Axion field on the polarization of the pulsar radiation by eva‎luating Stokes parameters and possibility the generation of circular polarization. In this way, we propose a method to discover Axion dark matter by examining its effects on the various properties of pulsar and then by using observational data we try to put some constraints on the key parameters of Axion such as mass and Axion-photon coupling.

سروش شاكري

صديقه سجاديان

فرهنگ لران، بهروز ميرزا