arXiv:2504.07130v1 Announce Type: new
Abstract: In this paper, we study the influence of the axion-plasmon medium, as proposed in [10.1103/PhysRevLett.120.181803]cite{Tercas:2018gxv}, on the optical properties of black holes in a Lorentz-violating spacetime containing a global monopole. Our primary aim is to provide a test for detecting the effects of a fixed axion-plasmon background within the framework of Ricci-coupled Kalb-Ramond bumblebee gravity. By extending the conventional Einstein-bumblebee model through a nonminimal coupling between the Kalb-Ramond field and the Ricci tensor, we demonstrate that the combined presence of a global monopole and Lorentz-violating effects induces significant modifications to the classical Schwarzschild lensing signature. Employing the Gauss-Bonnet theorem within an optical geometry approach, we derive an analytical expression for the deflection angle that incorporates both linear and quadratic contributions from the Lorentz-violating parameter and the monopole charge. Furthermore, we investigate how the axion-plasmon coupling alters light propagation, affecting key observable gravitational deflection angle. Our results indicate that these optical characteristics are notably sensitive to the axion-plasmon parameters, thereby offering promising observational signatures for probing new physics beyond standard general relativity.
Article Title: The Influence of Axion-Plasmon Medium on Black Hole Optics in a Lorentz-Violating Spacetime with a Global Monopole
Abstract
In this paper, the authors explore the effects of a fixed axion-plasmon background within the framework of Ricci-coupled Kalb-Ramond bumblebee gravity. They aim to detect the influence of the axion-plasmon medium on the optical properties of black holes in a Lorentz-violating spacetime containing a global monopole. By extending the conventional Einstein-bumblebee model, they demonstrate that the combined presence of a global monopole and Lorentz-violating effects leads to significant modifications in the classical Schwarzschild lensing signature. The authors utilize the Gauss-Bonnet theorem within an optical geometry approach to derive an analytical expression for the deflection angle, considering both linear and quadratic contributions from the Lorentz-violating parameter and the monopole charge. Additionally, they investigate the alteration of light propagation due to axion-plasmon coupling, which affects the gravitational deflection angle. The results suggest that the observed optical characteristics are highly sensitive to the axion-plasmon parameters, offering promising potential for observing new physics beyond standard general relativity.
Roadmap
1. Introduction
– Provide a brief overview of the study’s focus on the influence of the axion-plasmon medium on black hole optics in a Lorentz-violating spacetime with a global monopole.
– Highlight the significance of this research in probing new physics beyond standard general relativity.
2. Theoretical Framework
– Explain the Ricci-coupled Kalb-Ramond bumblebee gravity model and its extension from the conventional Einstein-bumblebee model through a nonminimal coupling between the Kalb-Ramond field and the Ricci tensor.
– Discuss the role of Lorentz-violating effects and the presence of a global monopole in inducing modifications to the classical Schwarzschild lensing signature.
3. Derivation of Deflection Angle
– Describe the utilization of the Gauss-Bonnet theorem within an optical geometry approach to derive an analytical expression for the deflection angle.
– Consider the linear and quadratic contributions from the Lorentz-violating parameter and the monopole charge in the expression.
4. Effects of Axion-Plasmon Coupling
– Investigate how the axion-plasmon coupling alters light propagation and affects the gravitational deflection angle.
– Emphasize the sensitivity of the observed optical characteristics to the axion-plasmon parameters.
5. Conclusion
– Summarize the key findings of the study, highlighting the significant modifications to the classical Schwarzschild lensing signature caused by the combined presence of a global monopole and Lorentz-violating effects.
– Discuss the potential of utilizing the observed optical characteristics as promising signatures for probing new physics beyond standard general relativity.
Challenges and Opportunities
- Challenges:
- – Understanding and quantifying the effects of the axion-plasmon medium on the black hole optics in a Lorentz-violating spacetime.
- – Overcoming the complexity of the extended Ricci-coupled Kalb-Ramond bumblebee gravity model to derive analytical expressions and make accurate predictions.
- Opportunities:
- – Potential for detecting and observing new physics beyond standard general relativity by studying the optical properties of black holes.
- – Promising observational signatures provided by the sensitivity of the optical characteristics to the axion-plasmon parameters.
- – Advancement in understanding the interplay between axion-plasmon coupling, Lorentz violation, and global monopoles in modifying the classical Schwarzschild lensing signature.