Neutron stars in 4D Einstein-Gauss-Bonnet gravity

Abstract

Since the derivation of a well-defined $D\to 4$ limit for 4D Einstein-Gauss-Bonnet (4DEGB) gravity coupled to a scalar field, there has been considerable interest in testing it as an alternative to Einstein's general theory of relativity. Past work has shown that this theory hosts interesting compact star solutions which are smaller in radius than a Schwarzschild black hole of the same mass in general relativity (GR), though the stability of such objects has been subject to question. In this paper we solve the equations for radial perturbations of neutron stars in the 4DEGB theory with Skyrme Lyon (SLy)/Brussels-Montreal Skyrme functionals (BSk) class equations of state (EOSs), along with the Müller-Serot (MS2) EOS, and show that the coincidence of stability and maximum mass points in GR is still present in this modified theory, with the interesting additional feature of solutions re-approaching stability near the black hole solution on the mass-radius diagram. Besides this, as expected from past work, we find that larger values of the 4DEGB coupling $\alpha$ tend to increase the mass of neutron stars of the same radius (due to a larger $\alpha$ weakening gravity) and move the maximum mass points of the solution branches closer to the black hole horizon.

References in corpus (38)

• f(R) Theories Of Gravity
• Modified Gravity and Cosmology
• Introduction to Modified Gravity and Gravitational Alternative for Dark Energy
• GW190814: Gravitational Waves from the Coalescence of a 23 M${}_{\odot }$ Black Hole with a 2.6 M${}_{\odot }$ Compact Object
• PSR J0030+0451 Mass and Radius from NICER Data and Implications for the Properties of Neutron Star Matter
• Einstein-Gauss-Bonnet gravity in 4-dimensional space-time
• Analytical representations of unified equations of state for neutron-star matter
• Charged Black Holes in AdS Spaces in $4D$ Einstein Gauss-Bonnet Gravity
• Rotating black holes in $4D$ Einstein-Gauss-Bonnet gravity and its shadow
• Horndeski Gravity as $D\to 4$ Limit of Gauss-Bonnet
• Is there a novel Einstein-Gauss-Bonnet theory in four dimensions?
• On Taking the $D\to 4$ limit of Gauss-Bonnet Gravity: Theory and Solutions
• Derivation of Regularized Field Equations for the Einstein-Gauss-Bonnet Theory in Four Dimensions
• Einsteinian cubic gravity
• The 4D Einstein-Gauss-Bonnet Theory of Gravity: A Review
• Analytical representations of unified equations of state of neutron-star matter
• The Radius of the High-mass Pulsar PSR J0740+6620 with 3.6 yr of NICER Data
• A note on the novel 4D Einstein-Gauss-Bonnet gravity
• Effective scalar-tensor description of regularized Lovelock gravity in four dimensions
• Vacua in novel 4D Einstein-Gauss-Bonnet Gravity: pathology and instability?
• Observational Constraints on the Regularized 4D Einstein-Gauss-Bonnet Theory of Gravity
• Quintessential Quartic Quasi-topological Quartet
• Equilibrium and stability of charged strange quark stars
• Dust collapse in 4D Einstein-Gauss-Bonnet gravity
• A light strange star in the remnant HESS J1731-347: minimal consistency checks
• Radial oscillations and stability of compact stars in $f(R,T)=R+2\beta T$ gravity
• Relativistic stars in 4D Einstein-Gauss-Bonnet gravity
• Astrophysical constraints on compact objects in 4D Einstein-Gauss-Bonnet gravity
• Bardeen Black Holes in the Regularized $4D$ Einstein--Gauss--Bonnet Gravity
• Classification of shift-symmetric Horndeski theories and hairy black holes
• Black Holes in the Scalar-Tensor Formulation of 4D Einstein-Gauss-Bonnet Gravity: Uniqueness of Solutions, and a New Candidate for Dark Matter
• Limits on stellar structures in Lovelock theories of gravity
• Nonsingular Black Holes in $4D$ Einstein--Gauss--Bonnet Gravity
• Realistic neutron star models in $f(T)$ gravity
• Quark stars with a unified interacting equation of state in regularized 4D Einstein-Gauss-Bonnet gravity
• Electrically charged strange stars with an interacting quark matter equation of state
• Stellar Structure and Stability of Charged Interacting Quark Stars and Their Scaling Behaviour
• Cosmological Constraints on 4-Dimensional Einstein-Gauss-Bonnet Gravity

Cited by in corpus (5)

• Proca theory of four-dimensional regularized Gauss-Bonnet gravity and black holes with primary hair
• White dwarfs in regularized 4D Einstein-Gauss-Bonnet gravity
• Stellar modeling within regularized 4D Einstein-Gauss-Bonnet gravity in light of current astrophysical constraints
• Entropic uncertainty and coherence in Einstein-Gauss-Bonnet gravity
• Neutron Stars in Causal Scalar-Tensor Theories