101 citations · 747 across the 26 of their papers we have counts for
28 papers
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…
Reissner-Nordström geometry counterpart in semiclassical gravity
Julio Arrechea, Carlos Barceló, Raúl Carballo-Rubio +1
We compute the Renormalized Stress-Energy Tensor (RSET) of a massless minimally coupled scalar field in the Regularized Polyakov approximation, as well as its backreaction, on the…
Emergent gauge symmetries: Yang-Mills theory
Carlos Barceló, Raúl Carballo-Rubio, Luis J. Garay +1
Gauge symmetries remove unphysical states and guarantee that field theories are free from the pathologies associated with these states. In this work we find a set of general condit…
Inversion of statistics and thermalization in the Unruh effect
Julio Arrechea, Carlos Barceló, Luis J. Garay +1
We derive a master equation for the reduced density matrix of a uniformly accelerating quantum detector in arbitrary dimensions, generically coupled to a field initially in its vac…
Black hole inner horizon evaporation in semiclassical gravity
Carlos Barceló, Valentin Boyanov, Raúl Carballo-Rubio +1
In this work we analyse the backreaction of a quantum field on a spherically symmetric black hole geometry with an inner horizon, i.e. an internal boundary of the trapped region. W…
Interpretations and naturalness in the radiation-reaction problem
Carlos Barceló, Luis J. Garay, Jaime Redondo-Yuste
After more than a century of history, the radiation-reaction problem in classical electrodynamics still surprises and puzzles new generations of researchers. Here we revise and exp…
Asymptotic horizon formation, spacetime stretching and causality
Carlos Barceló, Valentin Boyanov, Raúl Carballo-Rubio +1
In this work we analyse asymptotically flat, spherically symmetric spacetimes in which an event horizon is present without any trapped surfaces. We identify two types of such space…
Schwarzschild geometry counterpart in semiclassical gravity
Julio Arrechea, Carlos Barceló, Raúl Carballo-Rubio +1
We investigate the effects of vacuum polarization on vacuum static spherically-symmetric spacetimes. We start from the Polyakov approximation to the renormalized stress-energy tens…
Semiclassical gravity effects near horizon formation
Carlos Barceló, Valentin Boyanov, Raúl Carballo-Rubio +1
We study the magnitude of semiclassical gravity effects near the formation of a black-hole horizon in spherically-symmetric spacetimes. As a probe for these effects we use a quanti…
Generalized no-hair theorems without horizons
Carlos Barceló, Raúl Carballo-Rubio, Stefano Liberati
The simplicity of black holes, as characterized by no-hair theorems, is one of the most important mathematical results in the framework of general relativity. Are these theorems un…
Weyl relativity: A novel approach to Weyl's ideas
Carlos Barceló, Raúl Carballo-Rubio, Luis J. Garay
In this paper we revisit the motivation and construction of a unified theory of gravity and electromagnetism, following Weyl's insights regarding the appealing potential connection…
Exponential fading to white of black holes in quantum gravity
Carlos Barceló, Raúl Carballo-Rubio, Luis J. Garay
Quantization of the gravitational field may allow the existence of a decay channel of black holes into white holes with an explicit time-reversal symmetry. The definition of a mean…
A tensorial description of particle perception in black-hole physics
Luis C. Barbado, Carlos Barceló, Luis J. Garay +1
In quantum field theory in curved backgrounds, one typically distinguishes between objective, tensorial, quantities such as the Renormalized Stress-Energy Tensor (RSET) and subject…
Where does the physics of extreme gravitational collapse reside?
Carlos Barceló, Raúl Carballo-Rubio, Luis J. Garay
The gravitational collapse of massive stars serves to manifest the most severe deviations of general relativity with respect to Newtonian gravity: the formation of horizons and spa…
Uncovering the effective spacetime: Lessons from the effective field theory rationale
Carlos Barceló, Raúl Carballo-Rubio, Luis J. Garay
The cosmological constant problem can be understood as the failure of the decoupling principle behind effective field theory, so that some quantities in the low-energy theory are e…
Quantum frictionless trajectories versus geodesics
Luis C. Barbado, Carlos Barceló, Luis J. Garay
Moving particles outside a star will generally experience quantum friction caused by the Unruh radiation reaction. There exist however radial trajectories that lack this effect (in…
Some not-so-common ideas about gravity
Raúl Carballo-Rubio, Carlos Barceló, Luis J. Garay
Most of the approaches to the construction of a theory of quantum gravity share some principles which do not have specific experimental support up to date. Two of these principles…
Transformational acoustic metamaterials based on pressure gradients
C. García-Meca, S. Carloni, C. Barceló +3
We apply a homogenization process to the acoustic velocity potential wave equation. The study of various examples shows that the resulting effective properties are different from t…
The lifetime problem of evaporating black holes: mutiny or resignation
Carlos Barceló, Raúl Carballo-Rubio, Luis J. Garay +1
It is logically possible that regularly evaporating black holes exist in nature. In fact, the prevalent theoretical view is that these are indeed the real objects behind the curtai…
Mutiny at the white-hole district
Carlos Barceló, Raúl Carballo-Rubio, Luis J. Garay
The white-hole sector of Kruskal's solution is almost never used in physical applications. However, it might contain the solution to many of the problems associated with gravitatio…
Electromagnetism as an emergent phenomenon: a step-by-step guide
Carlos Barceló, Raúl Carballo-Rubio, Luis J. Garay +1
We give a detailed description of electrodynamics as an emergent theory from condensed-matter-like structures, not only {\it per se} but also as a warm-up for the study of the much…
Absence of cosmological constant problem in special relativistic field theory of gravity
Carlos Barceló, Raúl Carballo-Rubio, Luis J. Garay
The principles of quantum field theory in flat spacetime suggest that gravity is mediated by a massless particle with helicity , the so-called graviton. It is regarded as tex…
Unimodular gravity and general relativity from graviton self-interactions
Carlos Barceló, Raúl Carballo-Rubio, Luis J. Garay
It is commonly accepted that general relativity is the only solution to the consistency problem that appears when trying to build a theory of interacting gravitons (massless spin-2…
Spacetime transformation acoustics
C. García-Meca, S. Carloni, C. Barceló +3
A recently proposed analogue transformation method has allowed the extension of transformation acoustics to general spacetime transformations. We analyze here in detail the differe…