133 citations · 1.1k across the 54 of their papers we have counts for
56 papers
On the Modes at the Schwarzschild Black Hole Horizon
Dimitrios Giataganas, Alex Kehagias, Antonio Riotto
We discuss the origin of the modes appearing at the Schwarzschild black hole horizon and decaying at integer multiples of the surface gravity. We argue that no excitations generate…
The Schwarzschild Black Hole in an External Gravitational Tidal Field: the Quasinormal Spectrum
Dimitrios Giataganas, Alex Kehagias, Antonio Riotto
A black hole need not ring down in isolation, since a nearby companion can subject it to an external gravitational tide. We calculate how a quadrupole tide modifies the Schwarzschi…
Thermal Origin of Black Hole Quasinormal Modes
D. Giataganas, G. F. Giudice, A. Kehagias +2
When a black hole rings after a merger, it emits gravitational waves at characteristic frequencies known as quasinormal modes (QNMs). In the eikonal limit, these modes are governed…
Black Hole Photon Rings Saturate the Quantum Chaos Bound
D. Giataganas, G. F. Giudice, A. Kehagias +2
We study the quantum chaos bound in the photon ring region surrounding black holes. By evaluating the Lyapunov exponent associated with unstable null geodesics in a broad class of…
Black Hole Mergers as the Fastest Photon Ring Scramblers
D. Giataganas, G. F. Giudice, A. Ianniccari +5
Black holes are the most efficient scramblers in nature. By mapping the instantaneous mass and angular momentum of two spinless black holes in a quasi-circular binary onto those of…
Timelike Entanglement Entropy and Renormalization Group Flow Irreversibility
Dimitrios Giataganas
We study holographic c-theorems based on timelike entanglement entropy and show that a timelike c-function captures irreversible renormalization group (RG) flow. We demonstrate tha…