Lumos Extrema
arXiv:2408.08308 · doi:10.1007/JHEP03(2025)168
Abstract
We consider trajectories of massless particles in the presence of charged black holes in asymptotically AdS spacetimes in arbitrary dimensions. We study the properties of the photon ring in the (near-)extremal limit and show that the photon ring can probe the near-horizon region in two different scenarios: in high enough number of spacetime dimensions or when the massless particle carries an electric charge. We propose a simple -prescription for implementing the JWKB approximation and show its utility in various contexts. We calculate the quasi-normal modes for charged fields in the eikonal limit and show the emergence of a new time-scale of relaxation in the dual field theory side. In the near-extremal limit, we show generally that the time-scale of decay of the perturbations is governed by the chemical potential. We also verify our analytical results numerically. The -prescription allows us to study the superradiant modes and the associated instabilities in the eikonal limit easily. We comment on some related aspects regarding near-extremal black holes.
31 pages, 7 figures; v2: Additional comments and references, version published in JHEP
References in corpus (29)
- Quasinormal modes of black holes and black branes
- Quasinormal modes of black holes: from astrophysics to string theory
- Minkowski-space correlators in AdS/CFT correspondence: recipe and applications
- Geodesic stability, Lyapunov exponents and quasinormal modes
- Quasinormal Modes of AdS Black Holes and the Approach to Thermal Equilibrium
- The geometry of photon surfaces
- Thermoelectric transport in disordered metals without quasiparticles: the SYK models and holography
- Fermionic Localization of the Schwarzian Theory
- Light rings as observational evidence for event horizons: long-lived modes, ergoregions and nonlinear instabilities of ultracompact objects
- Notes on the complex Sachdev-Ye-Kitaev model
- A Bohr-Sommerfeld quantization formula for quasinormal frequencies of AdS black holes
- Lectures on AdS Black Holes, Holography and Localization
- Observational Signature of High Spin at the Event Horizon Telescope
- Jackiw-Teitelboim Gravity and Rotating Black Holes
- Extremal and Near-Extremal Black Holes and Near-
- The Large D Limit of Einstein's Equations
- Einstein Rings in Holography
- Gravitational orbits, double-twist mirage, and many-body scars
- Holographic Einstein Ring of a Charged AdS Black Hole
- An AdS/EFT correspondence at large charge
- Quasinormal modes of black holes in anti-de Sitter space: a numerical study of the eikonal limit
- Hidden conformal symmetry on the black hole photon sphere
- Black hole bulk-cone singularities
- ISCOs in AdS/CFT
- Photon Rings Around Warped Black Holes
- Photon Emission from Circular Equatorial Kerr Orbiters
- Near-Extremal Fluid Mechanics
- Newton vs. Coulomb in AdS/CFT and the Weak Gravity Conjecture
- Self-Similar Gravitational Dynamics, Singularities and Criticality in 2D