7.7k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre National de la Recherche ScientifiqueFR1k papers
- Instituto de Astrofísica de CanariasES1k papers
- Consejo Superior de Investigaciones CientíficasES987 papers
- Universidad de La LagunaES800 papers
- National Institute for AstrophysicsIT642 papers
- European Southern ObservatoryCL597 papers
- Universidad Nacional Autónoma de MéxicoMX554 papers
- Center for Astrophysics Harvard & SmithsonianUS517 papers
- Universidad Complutense de MadridES514 papers
- Max Planck Institute for AstronomyDE455 papers
- Observatoire de ParisFR454 papers
- Institute of Space SciencesES445 papers
101 papers · 1 filter
Regular black holes from pure gravity in four dimensions
Johanna Borissova, Raúl Carballo-Rubio
We derive static spherically symmetric regular black holes as vacuum solutions to purely gravitational theories in four dimensions. To that end, we construct four-dimensional non-p…
Effective geometrodynamics for renormalization-group improved black-hole spacetimes in spherical symmetry
Johanna Borissova, Raúl Carballo-Rubio
We consider the spherically reduced Einstein-Hilbert action, Einstein field equations and Schwarzschild spacetime modified by a renormalization-group (RG) scale-dependent gravitati…
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…
Scattering of massive particles from black holes and naked singularities
Angelos Karakonstantakis, Włodek Kluźniak, Maciek Wielgus
We performed a numerical study of the dynamics of massive particles orbiting black holes and naked singularities in the Reissner-Nordström geometry. We modeled a stream of particle…
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.…
Master field equations for spherically symmetric gravitational fields beyond general relativity
Raúl Carballo-Rubio
According to general relativity, black holes are incomplete, which prevents developing a complete physical description of their dynamical formation and evolution once quantum effec…
Regular Vaidya solutions of effective gravitational theories
Valentin Boyanov, Raúl Carballo-Rubio
We initiate the study of the dynamics of spherically symmetric spacetimes beyond general relativity through exact solutions of the field equations of second-order effective gravita…
Toroidal black holes in four dimensions
Carlos Barceló, Gerardo García-Moreno, Alejandro Jiménez Cano
From a purely geometric (kinematic) perspective, black holes in four dimensional spacetimes can have event horizons with arbitrary topologies. It is only when energy conditions are…
Beyond Buchdahl's limit: bilayered stars and thin-shell configurations
Julio Arrechea, Carlos Barceló, Gerardo García-Moreno +1
One of the theoretical motivations behind the belief that black holes as described by general relativity exist in nature is that it is hard to find matter configurations that mimic…
No-hair and almost-no-hair results for static axisymmetric black holes and ultracompact objects in astrophysical environments
Carlos Barceló, Raúl Carballo-Rubio, Luis J. Garay +1
No-hair theorems are uniqueness results constraining the form of the metric of black holes in general relativity. These theorems are typically formulated under idealized assumption…
Ultracompact horizonless objects in order-reduced semiclassical gravity
Julio Arrechea, Carlos Barceló, Raúl Carballo-Rubio +1
The backreaction of quantum fields in their vacuum state results in equilibrium structures that surpass the Buchdahl compactness limit. Such backreaction is encapsulated in the vac…
Nonexistence of a parent theory for general relativity and unimodular gravity
Gerardo García-Moreno, Alejandro Jiménez Cano
General Relativity (GR) and Unimodular Gravity (UG) provide two equivalent descriptions of gravity that differ in the nature of the cosmological constant. While GR is based on the…
Hawking radiation from an analogue bouncing geometry
Alberto García Martín-Caro, Gerardo García-Moreno, Javier Olmedo +1
We propose a setting that simulates Hawking radiation from an analogue bouncing geometry, i.e., a collapsing geometry that reverts its collapse after a finite time, in a setup cons…
Stellar equilibrium on a physical vacuum soil
Julio Arrechea, Carlos Barceló
We show that the repulsive effects associated to the zero-point energies of quantum fields are capable of supporting ultracompact stars that overcome the compactness limits present…
Asymptotically flat vacuum solutions in order-reduced semiclassical gravity
Julio Arrechea, Carlos Barceló, Raúl Carballo-Rubio +1
We investigate the effects of quantum backreaction on the Schwarzschild geometry in the semiclassical approximation. The renormalized stress-energy tensor (RSET) of a scalar field…
Bootstrapping gravity and its extension to metric-affine theories
Adrià Delhom, Gerardo García-Moreno, Manuel Hohmann +2
In this work we study diffeomorphism-invariant metric-affine theories of gravity from the point of view of self-interacting field theories on top of Minkowski spacetime (or other b…
Warp Drive Aerodynamics
Carlos Barceló, Valentin Boyanov, Luis J. Garay +2
In this work we analyse the potential for a warp drive spacetime to develop instabilities due to the presence of quantum matter. Particularly, we look for points of infinite bluesh…
Unimodular Gravity vs General Relativity: A status report
Raúl Carballo-Rubio, Luis J. Garay, Gerardo García-Moreno
Unimodular Gravity is an alternative to General Relativity (GR) which, however, is so closely related to the latter that one can wonder to what extent they are different. The diffe…
Classical mass inflation vs semiclassical inner horizon inflation
Carlos Barceló, Valentin Boyanov, Raúl Carballo-Rubio +1
We analyse the geometry of a spherically symmetric black hole with an inner and outer apparent horizon which is perturbed by spherical null shells of matter. On a classical level w…
Chronology Protection Implementation in Analogue Gravity
Carlos Barceló, Jokin Eguia Sánchez, Gerardo García-Moreno +1
Analogue gravity systems offer many insights into gravitational phenomena, both at the classical and at the semiclassical level. The existence of an underlying Minkowskian structur…
Semiclassical relativistic stars
Julio Arrechea, Carlos Barceló, Raúl Carballo-Rubio +1
We present strong evidence that semiclassical gravity can give place to self-consistent ultracompact stars beyond the Buchdahl limit. We integrate the semiclassical equations of (s…
Toward a mechanism for the emergence of gravity
Carlos Barceló, Raúl Carballo-Rubio, Luis J. Garay +1
One of the main problems that emergent-gravity approaches face is explaining how a system that does not contain gauge symmetries ab initio might develop them effectively in some re…
Constraints on black-hole charges with the 2017 EHT observations of M87*
Prashant Kocherlakota, Luciano Rezzolla, Heino Falcke +234
Our understanding of strong gravity near supermassive compact objects has recently improved thanks to the measurements made by the Event Horizon Telescope (EHT). We use here the M8…
Semiclassical constant-density spheres in a regularized Polyakov approximation
Julio Arrechea, Carlos Barceló, Raúl Carballo-Rubio +1
We provide an exhaustive analysis of the complete set of solutions of the equations of stellar equilibrium under semiclassical effects. As classical matter we use a perfect fluid o…