Novel Stellar Astrophysics from Extended Gravity

Abstract

Novel implications on neutron stars come from extended gravity. Specifically, the GW190814 event indicated the probability of having large mass stars in the mass-gap region $2.5-5M_{\odot }$. If the secondary component of GW190814 is a neutron star, such large masses are marginally supported by General Relativity (GR), since a very stiff Equation of State (EoS) would be needed to describe such large mass neutron stars, which would be incompatible with the GW170817 event, without any modification of gravity. In view of the two groundbreaking gravitational wave observations, we critically discuss the elevated role of extensions of GR towards the successful description of the GW190814 event, and we also speculate in a quantitative way on the important issue of the largest allowed neutron star mass.

arXiv commentEPL Accepted

References in corpus (8)

• Extended Theories of Gravity
• GW190814: Gravitational Waves from the Coalescence of a 23 M${}_{\odot }$ Black Hole with a 2.6 M${}_{\odot }$ Compact Object
• The Maximum Mass of a Neutron Star
• Curing singularities in cosmological evolution of F(R) gravity
• Extended Gravity Description for the GW190814 Supermassive Neutron Star
• Causal Limit of Neutron Star Maximum Mass in $f(R)$ Gravity in View of GW190814
• On the maximum mass limit of neutron stars in scalar-tensor gravity
• Light bending in $f(T)$ gravity

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• Rotating black hole in $f(R)$ theory
• Spherical doubly warped spacetimes for radiating stars and cosmology
• Neutron Stars in Modified Teleparallel Gravity
• Solving Tolman-Oppenheimer-Volkoff equations in f(T) gravity: a novel approach applied to some realistic equations of state
• Early evolution of fully convective stars in scalar-tensor gravity
• Compact relativistic geometries in $f(R,G)$ gravity
• Anti-de Sitter neutron stars in the theory of gravity with nonminimal derivative coupling
• Gravitational Collapse of Anisotropic Compact Stars in Modified $f(R)$ Gravity