Inflationary attractors predictions for static neutron stars in the mass-gap region

In this work we study static neutron stars in the context of several inflationary models which are popular in cosmology. These inflationary models are nonminimally coupled scalar theories which yield a viable inflationary phenomenology in both Jordan and Einstein frames. By considering the constrain...

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Autores: Odintsov, Sergei D., Oikonomou, Vasilis K.
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2023
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/336737
Acesso em linha:http://hdl.handle.net/10261/336737
Access Level:acceso abierto
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spelling Inflationary attractors predictions for static neutron stars in the mass-gap regionOdintsov, Sergei D.Oikonomou, Vasilis K.In this work we study static neutron stars in the context of several inflationary models which are popular in cosmology. These inflationary models are nonminimally coupled scalar theories which yield a viable inflationary phenomenology in both Jordan and Einstein frames. By considering the constraints from inflationary theories, which basically determine the values of the potential strength, usually considered as a free parameter in astrophysical neutron star works, we construct and solve the Tolman-Oppenheimer-Volkoff equations using a solid Python-3 LSODA integrator. For our study we consider several popular inflationary models, such as the universal attractors, the Rp attractors (three distinct model values), the induced inflation, the quadratic inflation, the Higgs inflation and the a-attractors (two distinct model values) and for the following popular equations of state the WFF1, the SLy, the APR, the MS1, the AP3, the AP4, the ENG, the MPA1 and the MS1b. We construct the M−R diagram and we confront the resulting theory with theoretical and observational constraints. As we demonstrate, remarkably, all the neutron stars produced by all the inflationary models we considered are compatible with all the constraints for the MPA1 equation of state. It is notable that for this particular equation of state, the maximum masses of the neutron stars are in the mass-gap region with M>2.5M⊙, but lower than the three solar masses causal limit. Another important feature of our work is that it may be possible to discriminate inflationary attractors which at the cosmological level are indistinguishable using the M−R graphs of static neutron stars, however we point out the limitations in discriminating the inflationary attractors. Also we show that the WFF1, MS1 and MS1b seem to be entirely ruled out, regarding a viable description of static neutron stars. We also make the observation that as the NICER constraints are pushed towards larger radii, as for example in the case of the black widow pulsar PSR J0952-0607, it seems that equations of state that produce neutron stars with maximum masses in the mass gap region, with M>2.5M⊙, but lower than the three solar masses causal limit, are favored and are compatible with the modified NICER constraints. Finally we question the ability of the MPA1 equation of state to pass all the theoretical and observational constraints and we impose the question whether this equation of state plays any fundamental role in static neutron star physics.This work was supported by MINECO (Spain), Project No. PID2019–104397GB-I00 (S. D. O.). This work by S. D. O. was also partially supported by the program Unidad de Excelencia Maria de Maeztu CEX2020-001058-M, Spain.Peer reviewedAmerican Physical SocietyMinisterio de Ciencia, Innovación y Universidades (España)Agencia Estatal de Investigación (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202320232023info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/336737reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-104397GB-I00info:eu-repo/grantAgreement/AEI//CEX2020-001058-Mhttps://doi.org/10.1103/PhysRevD.107.104039Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3367372026-05-22T06:33:51Z
dc.title.none.fl_str_mv Inflationary attractors predictions for static neutron stars in the mass-gap region
title Inflationary attractors predictions for static neutron stars in the mass-gap region
spellingShingle Inflationary attractors predictions for static neutron stars in the mass-gap region
Odintsov, Sergei D.
title_short Inflationary attractors predictions for static neutron stars in the mass-gap region
title_full Inflationary attractors predictions for static neutron stars in the mass-gap region
title_fullStr Inflationary attractors predictions for static neutron stars in the mass-gap region
title_full_unstemmed Inflationary attractors predictions for static neutron stars in the mass-gap region
title_sort Inflationary attractors predictions for static neutron stars in the mass-gap region
dc.creator.none.fl_str_mv Odintsov, Sergei D.
Oikonomou, Vasilis K.
author Odintsov, Sergei D.
author_facet Odintsov, Sergei D.
Oikonomou, Vasilis K.
author_role author
author2 Oikonomou, Vasilis K.
author2_role author
dc.contributor.none.fl_str_mv Ministerio de Ciencia, Innovación y Universidades (España)
Agencia Estatal de Investigación (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
description In this work we study static neutron stars in the context of several inflationary models which are popular in cosmology. These inflationary models are nonminimally coupled scalar theories which yield a viable inflationary phenomenology in both Jordan and Einstein frames. By considering the constraints from inflationary theories, which basically determine the values of the potential strength, usually considered as a free parameter in astrophysical neutron star works, we construct and solve the Tolman-Oppenheimer-Volkoff equations using a solid Python-3 LSODA integrator. For our study we consider several popular inflationary models, such as the universal attractors, the Rp attractors (three distinct model values), the induced inflation, the quadratic inflation, the Higgs inflation and the a-attractors (two distinct model values) and for the following popular equations of state the WFF1, the SLy, the APR, the MS1, the AP3, the AP4, the ENG, the MPA1 and the MS1b. We construct the M−R diagram and we confront the resulting theory with theoretical and observational constraints. As we demonstrate, remarkably, all the neutron stars produced by all the inflationary models we considered are compatible with all the constraints for the MPA1 equation of state. It is notable that for this particular equation of state, the maximum masses of the neutron stars are in the mass-gap region with M>2.5M⊙, but lower than the three solar masses causal limit. Another important feature of our work is that it may be possible to discriminate inflationary attractors which at the cosmological level are indistinguishable using the M−R graphs of static neutron stars, however we point out the limitations in discriminating the inflationary attractors. Also we show that the WFF1, MS1 and MS1b seem to be entirely ruled out, regarding a viable description of static neutron stars. We also make the observation that as the NICER constraints are pushed towards larger radii, as for example in the case of the black widow pulsar PSR J0952-0607, it seems that equations of state that produce neutron stars with maximum masses in the mass gap region, with M>2.5M⊙, but lower than the three solar masses causal limit, are favored and are compatible with the modified NICER constraints. Finally we question the ability of the MPA1 equation of state to pass all the theoretical and observational constraints and we impose the question whether this equation of state plays any fundamental role in static neutron star physics.
publishDate 2023
dc.date.none.fl_str_mv 2023
2023
2023
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/10261/336737
url http://hdl.handle.net/10261/336737
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#
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-104397GB-I00
info:eu-repo/grantAgreement/AEI//CEX2020-001058-M
https://doi.org/10.1103/PhysRevD.107.104039
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
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
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