dc.creatorLópez Armengol, Federico Gastón
dc.creatorRomero, Gustavo Esteban
dc.date2017-01-25
dc.date2022-03-14T14:05:45Z
dc.date.accessioned2023-07-15T04:15:42Z
dc.date.available2023-07-15T04:15:42Z
dc.identifierhttp://sedici.unlp.edu.ar/handle/10915/132508
dc.identifierissn:0001-7701
dc.identifierissn:1572-9532
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7468871
dc.descriptionScalar-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.
dc.descriptionInstituto Argentino de Radioastronomía
dc.descriptionFacultad de Ciencias Astronómicas y Geofísicas
dc.formatapplication/pdf
dc.languageen
dc.rightshttp://creativecommons.org/licenses/by-nc-sa/4.0/
dc.rightsCreative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.subjectAstronomía
dc.subjectModified Gravity
dc.subjectVector Gravity
dc.subjectNeutron Stars
dc.titleNeutron stars in Scalar-Tensor-Vector Gravity
dc.typeArticulo
dc.typePreprint


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