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
- Institución
- Universidad Nacional de Río Negro
- OAI Identificador
- oai:rid.unrn.edu.ar:20.500.12049/2831
Ver los metadatos del registro completo
id |
RIDUNRN_bf6f2fbad7f5f21c816be09457994b34 |
---|---|
oai_identifier_str |
oai:rid.unrn.edu.ar:20.500.12049/2831 |
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 Negro2025-09-04T11:13:18Zoai: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:43692025-09-04 11:13:18.259RID-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 |
_version_ |
1842344127650332672 |
score |
12.623145 |