99 citations · 312 across the 20 of their papers we have counts for
21 papers
A Singularity Theorem for Quasi-Topological Gravities
Francesco Di Filippo
Quasi-topological theories of gravity have recently attracted substantial attention as several theories in this class have a non-singular black hole as a vacuum and spherically sym…
Gravitational quantum friction and the information-loss problem
Francesco Del Porro, Francesco Di Filippo
We study the gravitational collapse of a shell, modeled as a coherent state of quantum matter. Without adding any physics beyond semiclassical gravity, we show that the universal g…
Semiclassical regularity of compact trapped regions: From dynamical horizons to inner extremality
Raúl Carballo-Rubio, Francesco Di Filippo, Stefano Liberati +1
In eternal black-hole spacetimes, inner horizons are Cauchy horizons and are generically unstable. For non-extremal inner horizons, this includes both the classical mass-inflation…
Macroscopic backreaction of the trace anomaly on classical vacuum backgrounds
Raúl Carballo-Rubio, Francesco Di Filippo, Shinji Mukohyama +1
We study the backreaction of quantum fields in the Boulware vacuum state on the Schwarzschild geometry, using the Riegert--Mottola--Vaulin renormalized stress-energy tensor derived…
Imprints of quantum vacuum fluctuations on the gravitational field of a spherical mass
Raúl Carballo-Rubio, Francesco Di Filippo, Shinji Mukohyama +1
The Schwarzschild geometry, describing the gravitational field of a spherical mass in classical vacuum, is one of the most famous vacuum solutions of the Einstein field equations.…
Can light-rings self-gravitate?
Francesco Di Filippo, Luciano Rezzolla
In a spherically symmetric and static spacetime of a compact object, such as that of a Schwarzschild black hole, the light-ring is a 2-sphere where photons experience the only poss…
Fully extremal black holes: a black hole graveyard?
Francesco Di Filippo, Stefano Liberati, Matt Visser
While the standard point of view is that the ultimate endpoint of black hole evolution is determined by Hawking evaporation, there is a growing evidence that classical and semi-cla…
On the nature of inner light-rings
Francesco Di Filippo
Non-singular horizonless ultracompact objects provide a simple resolution to the black holes singularity problem. It has been shown that, if these objects are compact enough to exh…
Inner-extremal regular black holes from pure gravity
Francesco Di Filippo, Ivan Kolář, David Kubiznak
Recently it was shown that essentially all regular black hole models constructed so far can be obtained as solutions of vacuum gravity equations, upon considering an infinite serie…
Mass inflation without Cauchy horizons
Raúl Carballo-Rubio, Francesco Di Filippo, Stefano Liberati +1
Mass inflation is a well established instability, conventionally associated to Cauchy horizons (which are also inner trapping horizons) of stationary geometries, leading to a diver…
Constraints on thermalizing surfaces from infrared observations of supermassive black holes
Raúl Carballo-Rubio, Francesco Di Filippo, Stefano Liberati +1
Infrared observations of Sgr A and M87 are incompatible with the assumption that these sources have physical surfaces in thermal equilibrium with their accreting environmen…
Soft hair, dressed coordinates and information loss paradox
Francesco Di Filippo, Naoki Ogawa, Shinji Mukohyama +1
Understanding the dynamics of soft hair might shine some light on the information loss paradox. In this paper, we introduce a new coordinate system, dressed coordinates, in order t…
Singularity-free gravitational collapse: From regular black holes to horizonless objects
Raúl Carballo-Rubio, Francesco Di Filippo, Stefano Liberati +1
Penrose's singularity theorem implies that if a trapped region forms in a gravitational collapse, then a singularity must form as well within such region. However, it is widely exp…
Comment on "Regular evaporating black holes with stable cores"
Raúl Carballo-Rubio, Francesco Di Filippo, Stefano Liberati +2
Regular black holes are generically unstable because of the classical phenomenon that goes by the name of "mass inflation" which destabilizes the inner horizon. In a recent article…
Regular black holes without mass inflation instability
Raúl Carballo-Rubio, Francesco Di Filippo, Stefano Liberati +2
Generic models of regular black holes have separate outer and inner horizons, both with nonzero surface gravity. It has been shown that a nonzero inner horizon surface gravity resu…
Constraints on horizonless objects after the EHT observation of Sagittarius A*
Raúl Carballo-Rubio, Francesco Di Filippo, Stefano Liberati +1
The images of Sagittarius A recently released by the Event Horizon Telescope collaboration have been accompanied [Ap.J.Lett.\,{\bf 930\,\#2}\,(2022)\,L17] by an analysis of the…
Stability of the fundamental quasinormal mode in time-domain observations against small perturbations
Emanuele Berti, Vitor Cardoso, Mark Ho-Yeuk Cheung +4
Black hole spectroscopy with gravitational waves is an important tool to measure the mass and spin of astrophysical black holes and to test their Kerr nature. Next-generation groun…
Geodesically complete black holes in Lorentz-violating gravity
Raúl Carballo-Rubio, Francesco Di Filippo, Stefano Liberati +1
We present a systematic study of the geometric structure of non-singular spacetimes describing black holes in Lorentz-violating gravity. We start with a review of the definition of…
Hearts of Darkness: the inside out probing of black holes
Raúl Carballo-Rubio, Francesco Di Filippo, Stefano Liberati
Classical black holes shield us from the singularities that inevitably appear in general relativity. Being singularity regularization one of the main landmarks for a successful the…
From physical symmetries to emergent gauge symmetries
Carlos Barceló, Raúl Carballo-Rubio, Francesco Di Filippo +1
Gauge symmetries indicate redundancies in the description of the relevant degrees of freedom of a given field theory and restrict the nature of observable quantities. One of the pr…
Exact electronic bands for a periodic Poschl-Teller potential
Francesco Di Filippo, Canio Noce
We show that supersymmetry is a simple but powerful tool to exactly solve quantum mechanics problems. Here, the supersymmetric approach is used to analyse a quantum system with per…