337 citations · 1.8k across the 50 of their papers we have counts for
6 papers · 1 filter
High-order tail in Kerr spacetime
Marc Casals, Chris Kavanagh, Adrian C. Ottewill
We investigate the late-time tail of the retarded Green function for the dynamics of a linear field perturbation of Kerr spacetime. We develop an analytical formalism for obtaining…
Quantum Backreaction on Three-Dimensional Black Holes and Naked Singularities
Marc Casals, Alessandro Fabbri, Cristián Martínez +1
We analytically investigate backreaction by a quantum scalar field on two rotating Bañados-Teitelboim-Zanelli (BTZ) geometries: that of a black hole and that of a naked singularity…
Horizon Instability of Extremal Kerr Black Holes: Nonaxisymmetric Modes and Enhanced Growth Rate
Marc Casals, Samuel E. Gralla, Peter Zimmerman
We show that the horizon instability of the extremal Kerr black hole is associated with a singular branch point in the Green function at the superradiant bound frequency. We study…
Spin-1 Quasi-normal Frequencies in Schwarzschild space-time for Large Overtone Number
Marc Casals, Adrian C. Ottewill
We analytically investigate the spin-1 quasinormal mode frequencies of Schwarzschild black hole space-time. We formally determine these frequencies to arbitrary order as an expansi…
Global Hadamard form for the Green Function in Schwarzschild space-time
Marc Casals, Brien Nolan
The retarded Green function of a wave equation on a 4-dimensional curved background spacetime is a (generalized) function of two spacetime points and diverges when these are connec…
Quantum dress for a naked singularity
Marc Casals, Alessandro Fabbri, Cristián Martínez +1
We investigate semiclassical backreaction on a conical naked singularity space-time with a negative cosmological constant in (2+1)-dimensions. In particular, we calculate the renor…