Speaker
Description
Axions, hypothetical particles proposed to resolve several fundamental issues in cosmology and particle physics, in the presence of magnetic fields [1-3], leading to significant implications for astrophysical observations [4-6]. In this study we investigate the interaction of pseudoscalar axion with photons in a magnetized medium background medium.
We focus on a compact star magnetosphere in the region ($0.8 R_{lc}< z < R_{lc} $). Here $R_{lc}$ is the light cylinder radius equal to $\left(\frac{\Omega}{c}\right)$ when $\Omega$ is the angular speed of the compact star.
We analyze the polarimetric observables (for $\frac{eB}{m_{e}^{2}} << 1$) like polarization angle ($\psi_{p}$) of photons as a function of their path length (z) through a magnetized plasma, taking into account the oscillation between photons and axions [7-9].
The resulting changes in polarization with photon pathlength provide critical insights into the properties of the magnetic field $B$ and the axion-photon coupling strength $g_{\phi^{\prime}\gamma\gamma}$. By executing both analytical and numerical methods, we explore the impact of various parameters, such as magnetic field $B$, photon energy $\omega$ and plasma frequency $\omega_{p}$ on the polarization angle. Following the methods of [10] our findings suggest that measuring the polarization angle in this context can serve as a powerful tool for probing the nature of axions and the magnetic environments of compact stars, contributing to the broader understanding of dark matter and fundamental physics.
References
[1] S. Weinberg, Phys. Rev. Lett. 40, 223-226 (1978).
[2] F. Wilczek, Phys. Rev. Lett. 40, 279-282 (1978).
[3] R. Peccei and H. R. Quinn, Phys. Rev. Lett. 38, 1440-1443 (1977).
[4] G.G. Raffelt and L. Stodolsky, Phys. Rev. D 37, 1237 (1988).
[5] G.G. Raffelt, Stars as laboratories for fundamental physics: the astrophysics of neutrinos, axions, and other weakly interacting particles, (Chicago University Press), Chicago U.S.A. (1996).
[6] A. Ringwald,https://doi.org/10.48550/arXiv.1506.04259.
[7] Ankur Chaubey, Manoj K. Jaiswal, Avijit K. Ganguly, Phys. Rev. D 102, 123029 (2020).
[8] Ankur Chaubey, Manoj K. Jaiswal, Avijit K. Ganguly, Phys. Rev. D 107, 023008 (2023).
[9] Ankur Chaubey, Avijit K. Ganguly, Revista Mexicana de Astronomia y Astrophysica 60, 361-365(2024). .
[10] Ankur Chaubey, Manoj K. Jaiswal, Damini Singh, Venktesh Singh,
Eur. Phys. J C 6, 627 (2024).
| Field of contribution | Theory |
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