Understanding photon sphere and black hole shadow in dynamically evolving spacetimes
arXiv:1903.06376 · doi:10.1103/PhysRevD.99.104080
Abstract
We have derived the differential equation governing the evolution of the photon sphere for dynamical black hole spacetimes with or without spherical symmetry. Numerical solution of the same depicting evolution of the photon sphere has been presented for Vaidya, Reissner-Nordström-Vaidya and de-Sitter Vaidya spacetimes. It has been pointed out that evolution of the photon sphere depends crucially on the validity of the null energy condition by the in-falling matter and may present an observational window to even test it through black hole shadow. We have also presented the evolution of the photon sphere for slowly rotating Kerr-Vaidya spacetime and associated structure of black hole shadow. Finally, the effective graviton metric for Einstein-Gauss-Bonnet gravity has been presented, and the graviton sphere has been contrasted with the photon sphere in this context.
39 pages, Accepted in PRD
References in corpus (13)
- Event-horizon-scale structure in the supermassive black hole candidate at the Galactic Centre
- Jet Launching Structure Resolved Near the Supermassive Black Hole in M87
- A new method for shadow calculations: application to parameterised axisymmetric black holes
- Photon Rings around Kerr and Kerr-like Black Holes
- Unstable circular null geodesics of static spherically symmetric black holes, Regge poles and quasinormal frequencies
- Strong lensing of gravitational waves as seen by LISA
- Causality and Hyperbolicity of Lovelock Theories
- Causal Structures in Gauss-Bonnet gravity
- Constraining some Horndeski gravity theories
- The spatial relation between the event horizon and trapping horizon
- Metamorphoses of a photon sphere
- Shock Formation in Lovelock Theories
- Thermodynamics of quantum photon spheres