148 citations · 1.2k across the 38 of their papers we have counts for
7 papers · 2 filters
Black holes in asymptotically safe gravity and beyond
Astrid Eichhorn, Aaron Held
Asymptotically safe quantum gravity is an approach to quantum gravity that achieves formulates a standard quantum field theory for the metric. Therefore, even the deep quantum grav…
Instability of spherically-symmetric black holes in Quadratic Gravity
Aaron Held, Jun Zhang
We investigate the linear stability of the two known branches of spherically-symmetric black holes in Quadratic Gravity. We extend previous work on the long-wavelength (Gregory-Laf…
Quantum gravity lights up spinning black holes
Astrid Eichhorn, Aaron Held
Quantum-gravity effects in black holes are generally expected to be unobservable if they set in at transplanckian curvature scales. Here, we challenge this expectation. A near-crit…
Universal signatures of singularity-resolving physics in photon rings of black holes and horizonless objects
Astrid Eichhorn, Aaron Held, Philipp-Vincent Johannsen
Within quantum-gravity approaches and beyond, different mechanisms for singularity resolution in black holes exist. Under a set of assumptions that we spell out in detail, these me…
Scale-invariance at the core of quantum black holes
Johanna N. Borissova, Aaron Held, Niayesh Afshordi
We study spherically-symmetric solutions to a modified Einstein-Hilbert action with Renormalization Group scale-dependent couplings, inspired by Weinberg's Asymptotic Safety scenar…
Parameterizations of black-hole spacetimes beyond circularity
Héloïse Delaporte, Astrid Eichhorn, Aaron Held
We discuss parameterizations of black-hole spacetimes in and beyond General Relativity in view of their symmetry constraints: within the class of axisymmetric, stationary spacetime…
Schwarzschild quasi-normal modes of non-minimally coupled vector fields
Sebastian Garcia-Saenz, Aaron Held, Jun Zhang
We study perturbations of massive and massless vector fields on a Schwarzschild black-hole background, including a non-minimal coupling between the vector field and the curvature.…