Structure of compact stars in R-squared Palatini gravity

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We analyse configurations of compact stars in the so-called R-squared gravity in the Palatini formalism. Using a realistic equation of state we show that the mass-radius configurations are lighter than their counterparts in General Relativity. We also obtain the internal profiles, which run in stron...

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Autores principales: Teppa Pannia, Florencia Anabella, García, Federico, Pérez Bergliaffa, Santiago Esteban, Orellana, Mariana Dominga, Romero, Gustavo Esteban
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2017
Materias:
Astronomía
modified gravity
Palatini formalism
neutron stars
equation of state
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/125715
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-125715
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Astronomía
modified gravity
Palatini formalism
neutron stars
equation of state
spellingShingle Astronomía
modified gravity
Palatini formalism
neutron stars
equation of state
Teppa Pannia, Florencia Anabella
García, Federico
Pérez Bergliaffa, Santiago Esteban
Orellana, Mariana Dominga
Romero, Gustavo Esteban
Structure of compact stars in R-squared Palatini gravity
topic_facet Astronomía
modified gravity
Palatini formalism
neutron stars
equation of state
description We analyse configurations of compact stars in the so-called R-squared gravity in the Palatini formalism. Using a realistic equation of state we show that the mass-radius configurations are lighter than their counterparts in General Relativity. We also obtain the internal profiles, which run in strong correlation with the derivatives of the equation of state, leading to regions where the mass parameter decreases with the radial coordinate in a counter-intuitive way. In order to analyse such correlation, we introduce a parametrisation of the equation of state given by multiple polytropes, which allows us to explicitly control its derivatives. We show that, even in a limiting case where hard phase transitions in matter are allowed, the internal profile of the mass parameter still presents strange features and the calculated M-R configurations also yield neutron stars lighter than those obtained in General Relativity.
format Articulo
Preprint
author Teppa Pannia, Florencia Anabella
García, Federico
Pérez Bergliaffa, Santiago Esteban
Orellana, Mariana Dominga
Romero, Gustavo Esteban
author_facet Teppa Pannia, Florencia Anabella
García, Federico
Pérez Bergliaffa, Santiago Esteban
Orellana, Mariana Dominga
Romero, Gustavo Esteban
author_sort Teppa Pannia, Florencia Anabella
title Structure of compact stars in R-squared Palatini gravity
title_short Structure of compact stars in R-squared Palatini gravity
title_full Structure of compact stars in R-squared Palatini gravity
title_fullStr Structure of compact stars in R-squared Palatini gravity
title_full_unstemmed Structure of compact stars in R-squared Palatini gravity
title_sort structure of compact stars in r-squared palatini gravity
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/125715
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AT orellanamarianadominga structureofcompactstarsinrsquaredpalatinigravity
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bdutipo_str Repositorios
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