Semiclassical constant-density spheres in a regularized Polyakov approximation

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 of constant density; as the semiclassical source we use the renormalized stress-energy tensor (RSET) of a minimally coupl...

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Detalles Bibliográficos
Autores: Arrechea, Julio, Barceló, Carlos, Carballo Rubio, Raúl, Garay Elizondo, Luis Javier
Tipo de recurso: artículo
Fecha de publicación:2021
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/115444
Acceso en línea:https://hdl.handle.net/20.500.14352/115444
Access Level:acceso abierto
Palabra clave:53
Electromagnetic stress tensor
Black hole
Gravitational vacuum
Energy tensor
Space
Equations
Gravity
Field
Polarization
Geometry
Física (Física)
2212 Física Teórica
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oai_identifier_str oai:docta.ucm.es:20.500.14352/115444
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spelling Semiclassical constant-density spheres in a regularized Polyakov approximation Arrechea, Julio Barceló, Carlos Carballo Rubio, Raúl Garay Elizondo, Luis Javier 53 Electromagnetic stress tensor Black hole Gravitational vacuum Energy tensor Space Equations Gravity Field Polarization Geometry Física (Física) 2212 Física Teórica 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 of constant density; as the semiclassical source we use the renormalized stress-energy tensor (RSET) of a minimally coupled massless scalar field in the Boulware vacuum (the only vacuum consistent with asymptotic flatness and staticity). For the RSET we use a regularized version of the Polyakov approximation. We present a complete catalogue of the semiclassical self-consistent solutions which incorporates regular as well as singular solutions, showing that the semiclassical corrections are highly relevant in scenarios of high compactness. Semiclassical corrections allow the existence of ultracompact equilibrium configurations which have bounded pressures and masses up to a central core of Planckian radius, precisely where the regularized Polyakov approximation is not accurate. Our analysis strongly suggests the absence of a Buchdahl limit in semiclasical gravity, while indicating that the regularized Polyakov approximation used here must be improved to describe equilibrium configurations of arbitrary compactness that remain regular at the center of spherical symmetry. American Physical Society https://hdl.handle.net/20.500.14352/115444
title Semiclassical constant-density spheres in a regularized Polyakov approximation
spellingShingle Semiclassical constant-density spheres in a regularized Polyakov approximation
Arrechea, Julio
53
Electromagnetic stress tensor
Black hole
Gravitational vacuum
Energy tensor
Space
Equations
Gravity
Field
Polarization
Geometry
Física (Física)
2212 Física Teórica
title_short Semiclassical constant-density spheres in a regularized Polyakov approximation
title_full Semiclassical constant-density spheres in a regularized Polyakov approximation
title_fullStr Semiclassical constant-density spheres in a regularized Polyakov approximation
title_full_unstemmed Semiclassical constant-density spheres in a regularized Polyakov approximation
title_sort Semiclassical constant-density spheres in a regularized Polyakov approximation
author Arrechea, Julio
author_facet Arrechea, Julio
Barceló, Carlos
Carballo Rubio, Raúl
Garay Elizondo, Luis Javier
author_role author
author2 Barceló, Carlos
Carballo Rubio, Raúl
Garay Elizondo, Luis Javier
author2_role author
author
author
topic 53
Electromagnetic stress tensor
Black hole
Gravitational vacuum
Energy tensor
Space
Equations
Gravity
Field
Polarization
Geometry
Física (Física)
2212 Física Teórica
topic_facet 53
Electromagnetic stress tensor
Black hole
Gravitational vacuum
Energy tensor
Space
Equations
Gravity
Field
Polarization
Geometry
Física (Física)
2212 Física Teórica
description 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 of constant density; as the semiclassical source we use the renormalized stress-energy tensor (RSET) of a minimally coupled massless scalar field in the Boulware vacuum (the only vacuum consistent with asymptotic flatness and staticity). For the RSET we use a regularized version of the Polyakov approximation. We present a complete catalogue of the semiclassical self-consistent solutions which incorporates regular as well as singular solutions, showing that the semiclassical corrections are highly relevant in scenarios of high compactness. Semiclassical corrections allow the existence of ultracompact equilibrium configurations which have bounded pressures and masses up to a central core of Planckian radius, precisely where the regularized Polyakov approximation is not accurate. Our analysis strongly suggests the absence of a Buchdahl limit in semiclasical gravity, while indicating that the regularized Polyakov approximation used here must be improved to describe equilibrium configurations of arbitrary compactness that remain regular at the center of spherical symmetry.
publishDate 2021
format article
url https://hdl.handle.net/20.500.14352/115444
language eng
eu_rights_str_mv openAccess
publisher American Physical Society
institution Universidad Complutense de Madrid (UCM)
collection Docta Complutense
reponame_str Docta Complutense
instname_str Universidad Complutense de Madrid (UCM)
_version_ 1878434006208348161
publishDateSort 2021
author_browse Arrechea, Julio
Barceló, Carlos
Carballo Rubio, Raúl
Garay Elizondo, Luis Javier
publisherStr American Physical Society
score 6.9303427

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