Strange Quark Stars: The Role of Excluded Volume Effects

Autores
Lugones, G.; Grunfeld, Ana Gabriela
Año de publicación
2024
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We study cold strange quark stars employing an enhanced version of the quark-massdensity-dependent model, which incorporates excluded volume effects to address non-perturbativeQCD repulsive interactions. We provide a comparative analysis of our mass formula parametrizationwith previous models from the literature. We identify the regions within the parameter spacewhere three-flavor quark matter is more stable than the most tightly bound atomic nucleus (stabilitywindow). Specifically, we show that excluded volume effects do not change the Gibbs freeenergy per baryon at zero pressure, rendering the stability window unaffected. The curves of pressureversus energy density exhibit various shapes—convex upward, concave downward, or nearlylinear—depending on the mass parametrization. This behavior results in different patterns of increase,decrease, or constancy in the speed of sound as a function of baryon number density. Weanalyze the mass–radius relationship of strange quark stars, revealing a significant increase in maximumgravitational mass and a shift in the curves toward larger radii as the excluded volume effectintensifies. Excluded volume effects render our models compatible with all modern astrophysicalconstraints, including the properties of the recently observed low-mass compact object HESSJ1731.
Fil: Lugones, G.. Universidad Federal do Abc; Brasil
Fil: Grunfeld, Ana Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica; Argentina
Materia
neutron stars
equation of state
dense matter
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/238297
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/238297
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Strange Quark Stars: The Role of Excluded Volume EffectsLugones, G.Grunfeld, Ana Gabrielaneutron starsequation of statedense matterhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We study cold strange quark stars employing an enhanced version of the quark-massdensity-dependent model, which incorporates excluded volume effects to address non-perturbativeQCD repulsive interactions. We provide a comparative analysis of our mass formula parametrizationwith previous models from the literature. We identify the regions within the parameter spacewhere three-flavor quark matter is more stable than the most tightly bound atomic nucleus (stabilitywindow). Specifically, we show that excluded volume effects do not change the Gibbs freeenergy per baryon at zero pressure, rendering the stability window unaffected. The curves of pressureversus energy density exhibit various shapes—convex upward, concave downward, or nearlylinear—depending on the mass parametrization. This behavior results in different patterns of increase,decrease, or constancy in the speed of sound as a function of baryon number density. Weanalyze the mass–radius relationship of strange quark stars, revealing a significant increase in maximumgravitational mass and a shift in the curves toward larger radii as the excluded volume effectintensifies. Excluded volume effects render our models compatible with all modern astrophysicalconstraints, including the properties of the recently observed low-mass compact object HESSJ1731.Fil: Lugones, G.. Universidad Federal do Abc; BrasilFil: Grunfeld, Ana Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica; ArgentinaMDPI2024-05info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/238297Lugones, G.; Grunfeld, Ana Gabriela; Strange Quark Stars: The Role of Excluded Volume Effects; MDPI; Universe; 10; 6; 5-2024; 1-172218-1997CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.mdpi.com/2218-1997/10/6/233info:eu-repo/semantics/altIdentifier/doi/10.3390/universe10060233info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:20:18Zoai:ri.conicet.gov.ar:11336/238297instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-22 11:20:18.832CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Strange Quark Stars: The Role of Excluded Volume Effects
title Strange Quark Stars: The Role of Excluded Volume Effects
spellingShingle Strange Quark Stars: The Role of Excluded Volume Effects
Lugones, G.
neutron stars
equation of state
dense matter
title_short Strange Quark Stars: The Role of Excluded Volume Effects
title_full Strange Quark Stars: The Role of Excluded Volume Effects
title_fullStr Strange Quark Stars: The Role of Excluded Volume Effects
title_full_unstemmed Strange Quark Stars: The Role of Excluded Volume Effects
title_sort Strange Quark Stars: The Role of Excluded Volume Effects
dc.creator.none.fl_str_mv Lugones, G.
Grunfeld, Ana Gabriela
author Lugones, G.
author_facet Lugones, G.
Grunfeld, Ana Gabriela
author_role author
author2 Grunfeld, Ana Gabriela
author2_role author
dc.subject.none.fl_str_mv neutron stars
equation of state
dense matter
topic neutron stars
equation of state
dense matter
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We study cold strange quark stars employing an enhanced version of the quark-massdensity-dependent model, which incorporates excluded volume effects to address non-perturbativeQCD repulsive interactions. We provide a comparative analysis of our mass formula parametrizationwith previous models from the literature. We identify the regions within the parameter spacewhere three-flavor quark matter is more stable than the most tightly bound atomic nucleus (stabilitywindow). Specifically, we show that excluded volume effects do not change the Gibbs freeenergy per baryon at zero pressure, rendering the stability window unaffected. The curves of pressureversus energy density exhibit various shapes—convex upward, concave downward, or nearlylinear—depending on the mass parametrization. This behavior results in different patterns of increase,decrease, or constancy in the speed of sound as a function of baryon number density. Weanalyze the mass–radius relationship of strange quark stars, revealing a significant increase in maximumgravitational mass and a shift in the curves toward larger radii as the excluded volume effectintensifies. Excluded volume effects render our models compatible with all modern astrophysicalconstraints, including the properties of the recently observed low-mass compact object HESSJ1731.
Fil: Lugones, G.. Universidad Federal do Abc; Brasil
Fil: Grunfeld, Ana Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica; Argentina
description We study cold strange quark stars employing an enhanced version of the quark-massdensity-dependent model, which incorporates excluded volume effects to address non-perturbativeQCD repulsive interactions. We provide a comparative analysis of our mass formula parametrizationwith previous models from the literature. We identify the regions within the parameter spacewhere three-flavor quark matter is more stable than the most tightly bound atomic nucleus (stabilitywindow). Specifically, we show that excluded volume effects do not change the Gibbs freeenergy per baryon at zero pressure, rendering the stability window unaffected. The curves of pressureversus energy density exhibit various shapes—convex upward, concave downward, or nearlylinear—depending on the mass parametrization. This behavior results in different patterns of increase,decrease, or constancy in the speed of sound as a function of baryon number density. Weanalyze the mass–radius relationship of strange quark stars, revealing a significant increase in maximumgravitational mass and a shift in the curves toward larger radii as the excluded volume effectintensifies. Excluded volume effects render our models compatible with all modern astrophysicalconstraints, including the properties of the recently observed low-mass compact object HESSJ1731.
publishDate 2024
dc.date.none.fl_str_mv 2024-05
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/238297
Lugones, G.; Grunfeld, Ana Gabriela; Strange Quark Stars: The Role of Excluded Volume Effects; MDPI; Universe; 10; 6; 5-2024; 1-17
2218-1997
CONICET Digital
CONICET
url http://hdl.handle.net/11336/238297
identifier_str_mv Lugones, G.; Grunfeld, Ana Gabriela; Strange Quark Stars: The Role of Excluded Volume Effects; MDPI; Universe; 10; 6; 5-2024; 1-17
2218-1997
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.mdpi.com/2218-1997/10/6/233
info:eu-repo/semantics/altIdentifier/doi/10.3390/universe10060233
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv MDPI
publisher.none.fl_str_mv MDPI
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 12.982451

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