Neutron star masses in R-2-gravity

• Verfasst von: Sbisá, Fulvio [VerfasserIn]
• Verfasst von: Baqui, Pedro O. [VerfasserIn]
• Verfasst von: Miranda, Tays [VerfasserIn]
• Verfasst von: Piattella, Oliver F. [VerfasserIn]
• Titel: Neutron star masses in R-2-gravity
• Verf.angabe: Fulvio Sbisa, Pedro O. Baqui, Tays Miranda, Sergio E. Joras and Oliver F. Piattella
• Jahr: 2020
• Jahr des Originals: 2019
• Umfang: 12 S.
• Fussnoten: 14 Nov 2019 ; Gesehen am 14.04.2020
• Titel Quelle: Enthalten in: Physics of the Dark Universe
• Ort Quelle: Amsterdam [u.a.] : Elsevier, 2012
• Jahr Quelle: 2020
• Band/Heft Quelle: 27(2020), Seite 100411
• ISSN Quelle: 2212-6864
• DOI: doi:10.1016/j.dark.2019.100411
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: equation
• Sach-SW: f(R) gravity
• Sach-SW: models
• Sach-SW: modified gravity
• Sach-SW: Modified gravity
• Sach-SW: Neutron stars
• Sach-SW: radii
• K10plus-PPN: 1694429806

Abstract

We address the issue of the existence of inequivalent definitions of gravitational mass in R-2-gravity. We present several definitions of gravitational mass, and discuss the formal relations between them. We then consider the concrete case of a static and spherically symmetric neutron star, and solve numerically the equations of motion for several values of the free parameter of the model. We compare the features of the mass-radius relations obtained for each definition of gravitational mass, and we comment on their dependence on the free parameter. We then argue that R-2-gravity is a valuable proxy to discuss the existence of inequivalent definitions of gravitational mass in a generic modified gravity theory, and present some comments on the general case. (C) 2019 Elsevier B.V. All rights reserved.