53 citations · 197 across the 12 of their papers we have counts for
12 papers
Cone hierarchy and the screening of matter by gravity
Julio Arrechea, Carlos Barceló, Gil Jannes
In a previous paper by some of the authors (Gen. Rel. Grav. 56, 116, 2024), we introduced a novel paradigm with which to understand gravitational phenomena. We called it the Harmon…
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…
After collapse: On how a physical vacuum can change the black hole paradigm
Julio Arrechea, Carlos Barceló, Valentin Boyanov
Standard General Relativity assumes that, in the absence of classical matter sources, spacetime is empty. This chapter considers and analyses the new behaviours of the gravitationa…
The harmonic background paradigm, or why gravity is attractive
Carlos Barceló, Gil Jannes
In a work by Visser, Bassett and Liberati (VBL) [Nucl. Phys. B (Proc. Suppl.) 88, 267 (2000)] a relation was suggested between a null energy condition and the censorship of superlu…
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…
Hawking radiation as perceived by different observers (ERE2011 proceedings)
Luis C. Barbado, Carlos Barceló, Luis J. Garay
We study the perception of Hawking radiation by different observers outside a black hole. The analysis is done in terms of an effective-temperature function that varies along the t…
Hawking radiation as perceived by different observers: An analytic expression for the effective-temperature function
Luis C. Barbado, Carlos Barceló, Luis J. Garay
Given a field vacuum state in a black hole spacetime, this state can be analysed in terms of how it is perceived (in terms of particle content) by different observers. This can be…
The trans-Planckian problem as a guiding principle
Luis C. Barbado, Carlos Barceló, Luis J. Garay +1
We use the avoidance of the trans-Planckian problem of Hawking radiation as a guiding principle in searching for a compelling scenario for the evaporation of black holes or black-h…
Hawking radiation as perceived by different observers
Luis C. Barbado, Carlos Barceló, Luis J. Garay
We use a method recently introduced in Barceló et al (2011 Phys. Rev. D 83 41501), to analyse Hawking radiation in a Schwarzschild black hole as perceived by different observers in…
The two faces of quantum sound
C. Barcelo, L. J. Garay, G. Jannes
Fluctuations around a Bose-Einstein condensate can be described by means of Bogolubov theory leading to the notion of quasiparticle and antiquasiparticle familiar to non-relativist…
Quantum Non-Gravity and Stellar Collapse
C. Barcelo, L. J. Garay, G. Jannes
Observational indications combined with analyses of analogue and emergent gravity in condensed matter systems support the possibility that there might be two distinct energy scales…