Induced Circular Polarization on Photons Due to Interaction with Axion-Like Particles in Rotating Magnetic Field of Neutron Stars
arxiv(2023)
摘要
We investigate how the photon polarization is affected by the interaction
with axion-like particles (ALPs) in the rotating magnetic field of a neutron
star (NS). Using quantum Boltzmann equations the study demonstrates that the
periodic magnetic field of millisecond NSs enhances the interaction of photons
with ALPs and creates a circular polarization on them. A binary system
including an NS and a companion star could serve as a probe. When the NS is in
front of the companion star with respect to the earth observer, there is a
circular polarization on the previously linearly polarized photons as a result
of the interaction with ALPs there. After a half-binary period, the companion
star passes in front of the NS, and the circular polarization of photons
disappears and changes to linear. The excluded parameter space for a
millisecond NS with 300 Hz rotating frequency, highlights the coupling constant
of 1.7×10^-11 GeV^-1≤
g_aγγ≤1.6×10^-3 GeV^-1 for the ALP masses in
the range of 7×10^-12 eV≤ m_a≤1.5× 10^3 eV.
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