Optical Signatures of q-deformed solution in Einstein-Maxwell-dilaton Gravity
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| Format: | Preprint |
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2025
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| _version_ | 1866915698471600128 |
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| author | Sakkawattana, Chawit Promsiri, Chatchai Ponglertsakul, Supakchai |
| author_facet | Sakkawattana, Chawit Promsiri, Chatchai Ponglertsakul, Supakchai |
| contents | We consider null geodesics in the background of spherically symmetric object in Einstein-Maxwell-Dilaton (EMD) theory with coupling function $f(Φ)=e^{-2λΦ}$. The spherical solution is characteristically described by dilaton coupling $λ$, integrated dilaton flux $D$ and magnetic charge $P$. Then, we derive geodesic equations by using the Hamilton-Jacobi approach. The radial photon orbital equation on equatorial plane and effective potential are analyzed. The total deflection angle and trajectories of photon as a function of impact parameter $b$ are plotted with the variation of $λ,D$ and $P$. Furthermore, the relation between photon ring's width and the Lyapunov exponent is also explored. In addition, we use the Gralla-Lupsasca-Marrone (GLM) model to model intensity profile of optically thin accretion disk around the object. Hence, we construct optical images of the object surrounded by three distinct emission profiles. Lastly, we investigate the radius of innermost stable circular orbit (ISCO) for timelike geodesics. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_23551 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Optical Signatures of q-deformed solution in Einstein-Maxwell-dilaton Gravity Sakkawattana, Chawit Promsiri, Chatchai Ponglertsakul, Supakchai General Relativity and Quantum Cosmology We consider null geodesics in the background of spherically symmetric object in Einstein-Maxwell-Dilaton (EMD) theory with coupling function $f(Φ)=e^{-2λΦ}$. The spherical solution is characteristically described by dilaton coupling $λ$, integrated dilaton flux $D$ and magnetic charge $P$. Then, we derive geodesic equations by using the Hamilton-Jacobi approach. The radial photon orbital equation on equatorial plane and effective potential are analyzed. The total deflection angle and trajectories of photon as a function of impact parameter $b$ are plotted with the variation of $λ,D$ and $P$. Furthermore, the relation between photon ring's width and the Lyapunov exponent is also explored. In addition, we use the Gralla-Lupsasca-Marrone (GLM) model to model intensity profile of optically thin accretion disk around the object. Hence, we construct optical images of the object surrounded by three distinct emission profiles. Lastly, we investigate the radius of innermost stable circular orbit (ISCO) for timelike geodesics. |
| title | Optical Signatures of q-deformed solution in Einstein-Maxwell-dilaton Gravity |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2512.23551 |