Structure of neutron stars in R-squared gravity

Autores
Orellana, Mariana Dominga; García, Federico; Teppa Pannia, Florencia A.; Romero, Gustavo E.
Año de publicación
2013
Idioma
español castellano
Tipo de recurso
artículo
Estado
versión aceptada
Descripción
Fil: Orellana, Mariana D. Universidad Nacional de Río Negro; Argentina
Fil: Orellana, Mariana D. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
Fil: Orellana, Mariana D. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina.
Fil: Orellana, Mariana D. Instituto Argentino de Radioastronomia; Argentina
Fil: García, Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata; Argentina
Fil: García, Federico. Instituto Argentino de Radioastronomia; Argentina.
Fil: García, Federico. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Teppa Pannia, Florencia A. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Romero, Gustavo E. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata; Argentina
Fil: Romero, Gustavo E. Instituto Argentino de Radioastronomia; Argentina.
Fil: Romero, Gustavo E. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
The effects implied for the structure of compact objects by the modification of General Relativity produced by the generalization of the Lagrangian density to the form R plus alpha R-squared, where R is the Ricci curvature scalar, have been recently explored. It seems likely that this squared-gravity may allow heavier Neutron Stars (NSs) than GR. In addition, these objects can be useful to constrain free parameters of modified-gravity theories. The differences between alternative gravity theories is enhanced in the strong gravitational regime. In this regime, because of the complexity of the field equations, perturbative methods become a good choice to treat the problem. Following previous works in the field, we performed a numerical integration of the structure equations that describe NSs in f(R)-gravity, recovering their mass-radius relations, but focusing on particular features that arise from this approach in the profiles of the NS interior.We show that these profiles run in correlation with the second-order derivative of the analytic approximation to the Equation of State (EoS), which leads to regions where the enclosed mass decreases with the radius in a counter-intuitive way. We reproduce all computations with a simple polytropic EoS to separate zeroth-order modified gravity effects.
Materia
Ciencias Físicas
Modified Gravity
Neutron Stars
Generalised Gravity Equation
Ciencias Físicas
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
RID-UNRN (UNRN)
Institución
Universidad Nacional de Río Negro
OAI Identificador
oai:rid.unrn.edu.ar:20.500.12049/2831
Acceder
id RIDUNRN_bf6f2fbad7f5f21c816be09457994b34
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network_acronym_str RIDUNRN
repository_id_str 4369
network_name_str RID-UNRN (UNRN)
spelling Structure of neutron stars in R-squared gravityOrellana, Mariana DomingaGarcía, FedericoTeppa Pannia, Florencia A.Romero, Gustavo E.Ciencias FísicasModified GravityNeutron StarsGeneralised Gravity EquationCiencias FísicasFil: Orellana, Mariana D. Universidad Nacional de Río Negro; ArgentinaFil: Orellana, Mariana D. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; ArgentinaFil: Orellana, Mariana D. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina.Fil: Orellana, Mariana D. Instituto Argentino de Radioastronomia; ArgentinaFil: García, Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata; ArgentinaFil: García, Federico. Instituto Argentino de Radioastronomia; Argentina.Fil: García, Federico. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; ArgentinaFil: Teppa Pannia, Florencia A. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; ArgentinaFil: Romero, Gustavo E. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata; ArgentinaFil: Romero, Gustavo E. Instituto Argentino de Radioastronomia; Argentina.Fil: Romero, Gustavo E. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; ArgentinaThe effects implied for the structure of compact objects by the modification of General Relativity produced by the generalization of the Lagrangian density to the form R plus alpha R-squared, where R is the Ricci curvature scalar, have been recently explored. It seems likely that this squared-gravity may allow heavier Neutron Stars (NSs) than GR. In addition, these objects can be useful to constrain free parameters of modified-gravity theories. The differences between alternative gravity theories is enhanced in the strong gravitational regime. In this regime, because of the complexity of the field equations, perturbative methods become a good choice to treat the problem. Following previous works in the field, we performed a numerical integration of the structure equations that describe NSs in f(R)-gravity, recovering their mass-radius relations, but focusing on particular features that arise from this approach in the profiles of the NS interior.We show that these profiles run in correlation with the second-order derivative of the analytic approximation to the Equation of State (EoS), which leads to regions where the enclosed mass decreases with the radius in a counter-intuitive way. We reproduce all computations with a simple polytropic EoS to separate zeroth-order modified gravity effects.Springer2013-06-22info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfOrellana, Mariana D., García, Federico., Teppa Pannia, Florencia A. & Romero, Gustavo E. (2013). Structure of neutron stars in R-squared gravity. Springer; General Relativity And Gravitation; 45; 4; 771-7830001-7701http://link.springer.com/article/10.1007%2Fs10714-013-1501-5http://arxiv.org/abs/1301.5189https://rid.unrn.edu.ar/jspui/handle/20.500.12049/2831http://dx.doi.org/10.1007/s10714-013-1501-5spa45General Relativity And Gravitationinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/4.0/reponame:RID-UNRN (UNRN)instname:Universidad Nacional de Río Negro2025-09-29T14:29:22Zoai:rid.unrn.edu.ar:20.500.12049/2831instacron:UNRNInstitucionalhttps://rid.unrn.edu.ar/jspui/Universidad públicaNo correspondehttps://rid.unrn.edu.ar/oai/snrdrid@unrn.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:43692025-09-29 14:29:23.137RID-UNRN (UNRN) - Universidad Nacional de Río Negrofalse
dc.title.none.fl_str_mv Structure of neutron stars in R-squared gravity
title Structure of neutron stars in R-squared gravity
spellingShingle Structure of neutron stars in R-squared gravity
Orellana, Mariana Dominga
Ciencias Físicas
Modified Gravity
Neutron Stars
Generalised Gravity Equation
Ciencias Físicas
title_short Structure of neutron stars in R-squared gravity
title_full Structure of neutron stars in R-squared gravity
title_fullStr Structure of neutron stars in R-squared gravity
title_full_unstemmed Structure of neutron stars in R-squared gravity
title_sort Structure of neutron stars in R-squared gravity
dc.creator.none.fl_str_mv Orellana, Mariana Dominga
García, Federico
Teppa Pannia, Florencia A.
Romero, Gustavo E.
author Orellana, Mariana Dominga
author_facet Orellana, Mariana Dominga
García, Federico
Teppa Pannia, Florencia A.
Romero, Gustavo E.
author_role author
author2 García, Federico
Teppa Pannia, Florencia A.
Romero, Gustavo E.
author2_role author
author
author
dc.subject.none.fl_str_mv Ciencias Físicas
Modified Gravity
Neutron Stars
Generalised Gravity Equation
Ciencias Físicas
topic Ciencias Físicas
Modified Gravity
Neutron Stars
Generalised Gravity Equation
Ciencias Físicas
dc.description.none.fl_txt_mv Fil: Orellana, Mariana D. Universidad Nacional de Río Negro; Argentina
Fil: Orellana, Mariana D. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
Fil: Orellana, Mariana D. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina.
Fil: Orellana, Mariana D. Instituto Argentino de Radioastronomia; Argentina
Fil: García, Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata; Argentina
Fil: García, Federico. Instituto Argentino de Radioastronomia; Argentina.
Fil: García, Federico. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Teppa Pannia, Florencia A. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Romero, Gustavo E. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata; Argentina
Fil: Romero, Gustavo E. Instituto Argentino de Radioastronomia; Argentina.
Fil: Romero, Gustavo E. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
The effects implied for the structure of compact objects by the modification of General Relativity produced by the generalization of the Lagrangian density to the form R plus alpha R-squared, where R is the Ricci curvature scalar, have been recently explored. It seems likely that this squared-gravity may allow heavier Neutron Stars (NSs) than GR. In addition, these objects can be useful to constrain free parameters of modified-gravity theories. The differences between alternative gravity theories is enhanced in the strong gravitational regime. In this regime, because of the complexity of the field equations, perturbative methods become a good choice to treat the problem. Following previous works in the field, we performed a numerical integration of the structure equations that describe NSs in f(R)-gravity, recovering their mass-radius relations, but focusing on particular features that arise from this approach in the profiles of the NS interior.We show that these profiles run in correlation with the second-order derivative of the analytic approximation to the Equation of State (EoS), which leads to regions where the enclosed mass decreases with the radius in a counter-intuitive way. We reproduce all computations with a simple polytropic EoS to separate zeroth-order modified gravity effects.
description Fil: Orellana, Mariana D. Universidad Nacional de Río Negro; Argentina
publishDate 2013
dc.date.none.fl_str_mv 2013-06-22
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv Orellana, Mariana D., García, Federico., Teppa Pannia, Florencia A. & Romero, Gustavo E. (2013). Structure of neutron stars in R-squared gravity. Springer; General Relativity And Gravitation; 45; 4; 771-783
0001-7701
http://link.springer.com/article/10.1007%2Fs10714-013-1501-5
http://arxiv.org/abs/1301.5189
https://rid.unrn.edu.ar/jspui/handle/20.500.12049/2831
http://dx.doi.org/10.1007/s10714-013-1501-5
identifier_str_mv Orellana, Mariana D., García, Federico., Teppa Pannia, Florencia A. & Romero, Gustavo E. (2013). Structure of neutron stars in R-squared gravity. Springer; General Relativity And Gravitation; 45; 4; 771-783
0001-7701
url http://link.springer.com/article/10.1007%2Fs10714-013-1501-5
http://arxiv.org/abs/1301.5189
https://rid.unrn.edu.ar/jspui/handle/20.500.12049/2831
http://dx.doi.org/10.1007/s10714-013-1501-5
dc.language.none.fl_str_mv spa
language spa
dc.relation.none.fl_str_mv 45
General Relativity And Gravitation
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/4.0/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/4.0/
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Springer
publisher.none.fl_str_mv Springer
dc.source.none.fl_str_mv reponame:RID-UNRN (UNRN)
instname:Universidad Nacional de Río Negro
reponame_str RID-UNRN (UNRN)
collection RID-UNRN (UNRN)
instname_str Universidad Nacional de Río Negro
repository.name.fl_str_mv RID-UNRN (UNRN) - Universidad Nacional de Río Negro
repository.mail.fl_str_mv rid@unrn.edu.ar
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score 12.558318

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