Kinetic screening in nonlinear stellar oscillations and gravitational collapse

We consider k-essence, a scalar-tensor theory with first-order derivative self-interactions that can screen local scales from scalar fifth forces, while allowing for sizeable deviations from general relativity on cosmological scales. We construct fully nonlinear static stellar solutions that show th...

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Autores: Bezares, Miguel, Ter Haar, Lotte, Crisostomi, Marco, Barausse, Enrico, Palenzuela, Carlos
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2021
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/260711
Acesso em linha:http://hdl.handle.net/10261/260711
Access Level:acceso abierto
Palavra-chave:Alternative gravity theories
Neutron stars and pulsars
Numerical relativity
Dark energy
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spelling Kinetic screening in nonlinear stellar oscillations and gravitational collapseBezares, MiguelTer Haar, LotteCrisostomi, MarcoBarausse, EnricoPalenzuela, CarlosAlternative gravity theoriesNeutron stars and pulsarsNumerical relativityDark energyWe consider k-essence, a scalar-tensor theory with first-order derivative self-interactions that can screen local scales from scalar fifth forces, while allowing for sizeable deviations from general relativity on cosmological scales. We construct fully nonlinear static stellar solutions that show the presence of this screening mechanism, and we use them as initial data for simulations of stellar oscillations and gravitational collapse in spherical symmetry. We find that for k-essence theories of relevance for cosmology, the screening mechanism works in the case of stellar oscillation and suppresses the monopole scalar emission to undetectable levels. In collapsing stars, we find that the Cauchy problem, although locally well posed, can lead to diverging characteristic speeds for the scalar field. By introducing a "fixing equation"in the spirit of J. Cayuso et al. [Phys. Rev. D 96, 084043 (2017)PRVDAQ2470-001010.1103/PhysRevD.96.084043], inspired in turn by dissipative relativistic hydrodynamics, we manage to evolve collapsing neutron stars past the divergence of the characteristic speeds. We show that, in these systems, the screening mechanism is less efficient than for oscillating and static stars, because the collapsing star must shed away all of its scalar hair before forming a black hole. For k-essence theories of relevance for cosmology, the characteristic frequency of the resulting scalar monopole signal is too low for terrestrial detectors, but we conjecture that space-borne interferometers such as the Laser Interferometer Space Antenna might detect it if a supernova explodes in the Galaxy.We thank L. Lehner for enlightening conversations on the well-posedness of the Cauchy problem. M. B., L. t. H., M. C., and E. B. acknowledge support from the European Union’s H2020 ERC Consolidator Grant “Gravity from Astrophysical to Microscopic Scales” (Grant No. GRAMS-815673). C. P. acknowledges support from the Spanish Ministry of Economy and Competitiveness Grants No. AYA2016-80289-P and No. PID2019–110301 GB-I00 (AEI/FEDER, UE). M. B. acknowledges the support of the PHAROS COST Action (CA16214).American Physical SocietyEuropean CommissionMinisterio de Economía y Competitividad (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2022202220212022info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/260711reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/EC/H2020/815673info:eu-repo/grantAgreement/MINECO//AYA2016-80289-Pinfo:eu-repo/grantAgreement/MICIU//PID2019–110301http://doi.org/10.1103/PhysRevD.104.044022Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2607112026-05-22T06:33:51Z
dc.title.none.fl_str_mv Kinetic screening in nonlinear stellar oscillations and gravitational collapse
title Kinetic screening in nonlinear stellar oscillations and gravitational collapse
spellingShingle Kinetic screening in nonlinear stellar oscillations and gravitational collapse
Bezares, Miguel
Alternative gravity theories
Neutron stars and pulsars
Numerical relativity
Dark energy
title_short Kinetic screening in nonlinear stellar oscillations and gravitational collapse
title_full Kinetic screening in nonlinear stellar oscillations and gravitational collapse
title_fullStr Kinetic screening in nonlinear stellar oscillations and gravitational collapse
title_full_unstemmed Kinetic screening in nonlinear stellar oscillations and gravitational collapse
title_sort Kinetic screening in nonlinear stellar oscillations and gravitational collapse
dc.creator.none.fl_str_mv Bezares, Miguel
Ter Haar, Lotte
Crisostomi, Marco
Barausse, Enrico
Palenzuela, Carlos
author Bezares, Miguel
author_facet Bezares, Miguel
Ter Haar, Lotte
Crisostomi, Marco
Barausse, Enrico
Palenzuela, Carlos
author_role author
author2 Ter Haar, Lotte
Crisostomi, Marco
Barausse, Enrico
Palenzuela, Carlos
author2_role author
author
author
author
dc.contributor.none.fl_str_mv European Commission
Ministerio de Economía y Competitividad (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Alternative gravity theories
Neutron stars and pulsars
Numerical relativity
Dark energy
topic Alternative gravity theories
Neutron stars and pulsars
Numerical relativity
Dark energy
description We consider k-essence, a scalar-tensor theory with first-order derivative self-interactions that can screen local scales from scalar fifth forces, while allowing for sizeable deviations from general relativity on cosmological scales. We construct fully nonlinear static stellar solutions that show the presence of this screening mechanism, and we use them as initial data for simulations of stellar oscillations and gravitational collapse in spherical symmetry. We find that for k-essence theories of relevance for cosmology, the screening mechanism works in the case of stellar oscillation and suppresses the monopole scalar emission to undetectable levels. In collapsing stars, we find that the Cauchy problem, although locally well posed, can lead to diverging characteristic speeds for the scalar field. By introducing a "fixing equation"in the spirit of J. Cayuso et al. [Phys. Rev. D 96, 084043 (2017)PRVDAQ2470-001010.1103/PhysRevD.96.084043], inspired in turn by dissipative relativistic hydrodynamics, we manage to evolve collapsing neutron stars past the divergence of the characteristic speeds. We show that, in these systems, the screening mechanism is less efficient than for oscillating and static stars, because the collapsing star must shed away all of its scalar hair before forming a black hole. For k-essence theories of relevance for cosmology, the characteristic frequency of the resulting scalar monopole signal is too low for terrestrial detectors, but we conjecture that space-borne interferometers such as the Laser Interferometer Space Antenna might detect it if a supernova explodes in the Galaxy.
publishDate 2021
dc.date.none.fl_str_mv 2021
2022
2022
2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/260711
url http://hdl.handle.net/10261/260711
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/EC/H2020/815673
info:eu-repo/grantAgreement/MINECO//AYA2016-80289-P
info:eu-repo/grantAgreement/MICIU//PID2019–110301
http://doi.org/10.1103/PhysRevD.104.044022
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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