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Artículo

Neutron stars in Scalar-Tensor-Vector Gravity

Lopez Armengol, Federico GastonIcon ; Romero, Gustavo EstebanIcon
Fecha de publicación: 02/2017
Editorial: Springer
Revista: General Relativity And Gravitation
ISSN: 0001-7701
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Astronomía

Resumen

Scalar-Tensor-Vector Gravity (STVG), also referred as Modified Gravity (MOG), is an alternative theory of the gravitational interaction. Its weak field approximation has been successfully used to describe Solar System observations, galaxy rotation curves, dynamics of clusters of galaxies, and cosmological data, without the imposition of dark components. The theory was formulated by John Moffat in 2006. In this work, we derive matter-sourced solutions of STVG and construct neutron star models. We aim at exploring STVG predictions about stellar structure in the strong gravity regime. Specifically, we represent spacetime with a static, spherically symmetric manifold, and model the stellar matter content with a perfect fluid energy-momentum tensor. We then derive the modified Tolman?Oppenheimer?Volkoff equation in STVG and integrate it for different equations of state. We find that STVG allows heavier neutron stars than General Relativity (GR). Maximum masses depend on a normalized parameter that quantifies the deviation from GR. The theory exhibits unusual predictions for extreme values of this parameter. We conclude that STVG admits suitable spherically symmetric solutions with matter sources, relevant for stellar structure. Since recent determinations of neutron stars masses violate some GR predictions, STVG appears as a viable candidate for a new gravity theory.
Palabras clave: Modified Gravity , Neutron Stars , Vector Gravity
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/26514
DOI: http://dx.doi.org/10.1007/s10714-017-2184-0
URL: https://link.springer.com/article/10.1007%2Fs10714-017-2184-0
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Articulos(IAR)
Articulos de INST.ARG.DE RADIOASTRONOMIA (I)
Citación
Lopez Armengol, Federico Gaston; Romero, Gustavo Esteban; Neutron stars in Scalar-Tensor-Vector Gravity; Springer; General Relativity And Gravitation; 49; 2; 2-2017
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