On the formation and stability of fermionic dark matter haloes in a cosmological framework

Autores
Argüelles, Carlos Raúl; Díaz, Manuel Ignacio; Krut, Andreas; Yunis, Rafael
Año de publicación
2021
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The formation and stability of collisionless self-gravitating systems are long-standing problems, which date back to the work of D. Lynden-Bell on violent relaxation and extends to the issue of virialization of dark matter (DM) haloes. An important prediction of such a relaxation process is that spherical equilibrium states can be described by a Fermi–Dirac phase-space distribution, when the extremization of a coarse-grained entropy is reached. In the case of DM fermions, the most general solution develops a degenerate compact core surrounded by a diluted halo. As shown recently, the latter is able to explain the galaxy rotation curves, while the DM core can mimic the central black hole. A yet open problem is whether these kinds of astrophysical core–halo configurations can form at all, and whether they remain stable within cosmological time-scales. We assess these issues by performing a thermodynamic stability analysis in the microcanonical ensemble for solutions with a given particle number at halo virialization in a cosmological framework. For the first time, we demonstrate that the above core–halo DM profiles are stable (i.e. maxima of entropy) and extremely long-lived. We find the existence of a critical point at the onset of instability of the core–halo solutions, where the fermion-core collapses towards a supermassive black hole. For particle masses in the keV range, the core-collapse can only occur for Mvir 109 M starting at zvir ≈ 10 in the given cosmological framework. Our results prove that DM haloes with a core–halo morphology are a very plausible outcome within non-linear stages of structure formation.
Fil: Argüelles, Carlos Raúl. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
Fil: Díaz, Manuel Ignacio. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Física; Argentina
Fil: Krut, Andreas. Università di Roma; Italia
Fil: Yunis, Rafael. Università di Roma; Italia
Materia
METHODS: NUMERICAL
GALAXIES: HALOES
GALAXIES: NUCLEI
GALAXIES: FORMATION
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/156870
Acceder
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network_name_str CONICET Digital (CONICET)
spelling On the formation and stability of fermionic dark matter haloes in a cosmological frameworkArgüelles, Carlos RaúlDíaz, Manuel IgnacioKrut, AndreasYunis, RafaelMETHODS: NUMERICALGALAXIES: HALOESGALAXIES: NUCLEIGALAXIES: FORMATIONhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1The formation and stability of collisionless self-gravitating systems are long-standing problems, which date back to the work of D. Lynden-Bell on violent relaxation and extends to the issue of virialization of dark matter (DM) haloes. An important prediction of such a relaxation process is that spherical equilibrium states can be described by a Fermi–Dirac phase-space distribution, when the extremization of a coarse-grained entropy is reached. In the case of DM fermions, the most general solution develops a degenerate compact core surrounded by a diluted halo. As shown recently, the latter is able to explain the galaxy rotation curves, while the DM core can mimic the central black hole. A yet open problem is whether these kinds of astrophysical core–halo configurations can form at all, and whether they remain stable within cosmological time-scales. We assess these issues by performing a thermodynamic stability analysis in the microcanonical ensemble for solutions with a given particle number at halo virialization in a cosmological framework. For the first time, we demonstrate that the above core–halo DM profiles are stable (i.e. maxima of entropy) and extremely long-lived. We find the existence of a critical point at the onset of instability of the core–halo solutions, where the fermion-core collapses towards a supermassive black hole. For particle masses in the keV range, the core-collapse can only occur for Mvir 109 M starting at zvir ≈ 10 in the given cosmological framework. Our results prove that DM haloes with a core–halo morphology are a very plausible outcome within non-linear stages of structure formation.Fil: Argüelles, Carlos Raúl. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; ArgentinaFil: Díaz, Manuel Ignacio. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Física; ArgentinaFil: Krut, Andreas. Università di Roma; ItaliaFil: Yunis, Rafael. Università di Roma; ItaliaWiley Blackwell Publishing, Inc2021-04info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/156870Argüelles, Carlos Raúl; Díaz, Manuel Ignacio; Krut, Andreas; Yunis, Rafael; On the formation and stability of fermionic dark matter haloes in a cosmological framework; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 502; 3; 4-2021; 4227-42460035-8711CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1093/mnras/staa3986info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/502/3/4227/6056505info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:34:58Zoai:ri.conicet.gov.ar:11336/156870instacron: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:34982025-09-29 10:34:59.249CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv On the formation and stability of fermionic dark matter haloes in a cosmological framework
title On the formation and stability of fermionic dark matter haloes in a cosmological framework
spellingShingle On the formation and stability of fermionic dark matter haloes in a cosmological framework
Argüelles, Carlos Raúl
METHODS: NUMERICAL
GALAXIES: HALOES
GALAXIES: NUCLEI
GALAXIES: FORMATION
title_short On the formation and stability of fermionic dark matter haloes in a cosmological framework
title_full On the formation and stability of fermionic dark matter haloes in a cosmological framework
title_fullStr On the formation and stability of fermionic dark matter haloes in a cosmological framework
title_full_unstemmed On the formation and stability of fermionic dark matter haloes in a cosmological framework
title_sort On the formation and stability of fermionic dark matter haloes in a cosmological framework
dc.creator.none.fl_str_mv Argüelles, Carlos Raúl
Díaz, Manuel Ignacio
Krut, Andreas
Yunis, Rafael
author Argüelles, Carlos Raúl
author_facet Argüelles, Carlos Raúl
Díaz, Manuel Ignacio
Krut, Andreas
Yunis, Rafael
author_role author
author2 Díaz, Manuel Ignacio
Krut, Andreas
Yunis, Rafael
author2_role author
author
author
dc.subject.none.fl_str_mv METHODS: NUMERICAL
GALAXIES: HALOES
GALAXIES: NUCLEI
GALAXIES: FORMATION
topic METHODS: NUMERICAL
GALAXIES: HALOES
GALAXIES: NUCLEI
GALAXIES: FORMATION
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The formation and stability of collisionless self-gravitating systems are long-standing problems, which date back to the work of D. Lynden-Bell on violent relaxation and extends to the issue of virialization of dark matter (DM) haloes. An important prediction of such a relaxation process is that spherical equilibrium states can be described by a Fermi–Dirac phase-space distribution, when the extremization of a coarse-grained entropy is reached. In the case of DM fermions, the most general solution develops a degenerate compact core surrounded by a diluted halo. As shown recently, the latter is able to explain the galaxy rotation curves, while the DM core can mimic the central black hole. A yet open problem is whether these kinds of astrophysical core–halo configurations can form at all, and whether they remain stable within cosmological time-scales. We assess these issues by performing a thermodynamic stability analysis in the microcanonical ensemble for solutions with a given particle number at halo virialization in a cosmological framework. For the first time, we demonstrate that the above core–halo DM profiles are stable (i.e. maxima of entropy) and extremely long-lived. We find the existence of a critical point at the onset of instability of the core–halo solutions, where the fermion-core collapses towards a supermassive black hole. For particle masses in the keV range, the core-collapse can only occur for Mvir 109 M starting at zvir ≈ 10 in the given cosmological framework. Our results prove that DM haloes with a core–halo morphology are a very plausible outcome within non-linear stages of structure formation.
Fil: Argüelles, Carlos Raúl. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
Fil: Díaz, Manuel Ignacio. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Física; Argentina
Fil: Krut, Andreas. Università di Roma; Italia
Fil: Yunis, Rafael. Università di Roma; Italia
description The formation and stability of collisionless self-gravitating systems are long-standing problems, which date back to the work of D. Lynden-Bell on violent relaxation and extends to the issue of virialization of dark matter (DM) haloes. An important prediction of such a relaxation process is that spherical equilibrium states can be described by a Fermi–Dirac phase-space distribution, when the extremization of a coarse-grained entropy is reached. In the case of DM fermions, the most general solution develops a degenerate compact core surrounded by a diluted halo. As shown recently, the latter is able to explain the galaxy rotation curves, while the DM core can mimic the central black hole. A yet open problem is whether these kinds of astrophysical core–halo configurations can form at all, and whether they remain stable within cosmological time-scales. We assess these issues by performing a thermodynamic stability analysis in the microcanonical ensemble for solutions with a given particle number at halo virialization in a cosmological framework. For the first time, we demonstrate that the above core–halo DM profiles are stable (i.e. maxima of entropy) and extremely long-lived. We find the existence of a critical point at the onset of instability of the core–halo solutions, where the fermion-core collapses towards a supermassive black hole. For particle masses in the keV range, the core-collapse can only occur for Mvir 109 M starting at zvir ≈ 10 in the given cosmological framework. Our results prove that DM haloes with a core–halo morphology are a very plausible outcome within non-linear stages of structure formation.
publishDate 2021
dc.date.none.fl_str_mv 2021-04
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/11336/156870
Argüelles, Carlos Raúl; Díaz, Manuel Ignacio; Krut, Andreas; Yunis, Rafael; On the formation and stability of fermionic dark matter haloes in a cosmological framework; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 502; 3; 4-2021; 4227-4246
0035-8711
CONICET Digital
CONICET
url http://hdl.handle.net/11336/156870
identifier_str_mv Argüelles, Carlos Raúl; Díaz, Manuel Ignacio; Krut, Andreas; Yunis, Rafael; On the formation and stability of fermionic dark matter haloes in a cosmological framework; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 502; 3; 4-2021; 4227-4246
0035-8711
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1093/mnras/staa3986
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/502/3/4227/6056505
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
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 13.070432

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