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arXiv · 2501.03047

Geometric optics analysis in Lorentz violating Chern-Simons electrodynamics

Arpan Das·Hriditi Howlader·Alekha C. Nayak
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Abstract

We study the geometric optics limit of the electrodynamics in the presence of Lorentz violating Chern-Simons term in (3+1) dimensions. The Chern-Simons term couples the dual electromagnetic tensor to an external four-vector and the electromagnetic gauge field. For a fixed external four-vector, such a Chern-Simons term violates Lorentz invariance while maintaining the gauge invariance of the theory. In this analysis, we look into the consequences of Lorentz symmetry violating Chern-Simons term within the geometric optics limit of light rays propagating from a source to an observation point. We argue that the Ricci tensor and the Lorentz-violating term modify the dynamical equation for the gauge vector field. However, in the geometric optics limit, neither the space-time curvature nor the Chern-Simons term influences the intensity of light. Unlike the intensity, the polarization of light, on the other hand, can be influenced by the Lorentz-violating Chern-Simons term. Due to such an effect in the presence of Chern-Simons term, the photon emitting from astrophysical objects can undergo a change in polarization as it propagates in space.

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Arpan Das, Hriditi Howlader, Alekha C. Nayak. 2025-01-06. Geometric optics analysis in Lorentz violating Chern-Simons electrodynamics. https://arxiv.org/abs/2501.03047

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