Structure of neutron stars in R-squared gravity

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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-gravit...

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Autores principales: Orellana, Mariana Dominga, García, Federico, Teppa Pannia, Florencia Anabella, Romero, Gustavo Esteban
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2013
Materias:
Ciencias Astronómicas
Modified gravity
Neutron stars
Generalised gravity equation
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/100776
https://ri.conicet.gov.ar/11336/4551
http://link.springer.com/article/10.1007%2Fs10714-013-1501-5
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-100776
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Modified gravity
Neutron stars
Generalised gravity equation
spellingShingle Ciencias Astronómicas
Modified gravity
Neutron stars
Generalised gravity equation
Orellana, Mariana Dominga
García, Federico
Teppa Pannia, Florencia Anabella
Romero, Gustavo Esteban
Structure of neutron stars in R-squared gravity
topic_facet Ciencias Astronómicas
Modified gravity
Neutron stars
Generalised gravity equation
description 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.
format Articulo
Preprint
author Orellana, Mariana Dominga
García, Federico
Teppa Pannia, Florencia Anabella
Romero, Gustavo Esteban
author_facet Orellana, Mariana Dominga
García, Federico
Teppa Pannia, Florencia Anabella
Romero, Gustavo Esteban
author_sort Orellana, Mariana Dominga
title Structure of neutron stars in R-squared gravity
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
publishDate 2013
url http://sedici.unlp.edu.ar/handle/10915/100776
https://ri.conicet.gov.ar/11336/4551
http://link.springer.com/article/10.1007%2Fs10714-013-1501-5
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AT garciafederico structureofneutronstarsinrsquaredgravity
AT teppapanniaflorenciaanabella structureofneutronstarsinrsquaredgravity
AT romerogustavoesteban structureofneutronstarsinrsquaredgravity
bdutipo_str Repositorios
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