Astrophysical constraints on compact objects in 4D Einstein-Gauss-Bonnet gravity

Abstract

We study the properties of compact objects in a particular 4D Horndeski theory originating from higher dimensional Einstein-Gauss-Bonnet gravity. Remarkably, an exact vacuum solution is known. This compact object differs from general relativity mostly in the strong field regime. We discuss some properties of black holes in this framework and investigate in detail the properties of neutron stars, both static and in slow rotation. We find that for relatively modest deviations from general relativity, the secondary object in GW190814 is compatible with being a slowly-rotating neutron star, without resorting to very stiff or exotic equations of state. Remarkably, the equilibrium sequence of neutron stars matches asymptotically to the black hole limit, completetly closing the mass gap between neutron stars and black holes of same radius, although the stability of equilibrium solutions has yet to be determined. As a consequence, there exists a universal endpoint for the neutron star sequence, independent of the equation of state. In light of our results and of current observational constraints, we discuss specific constraints on the coupling constant that parametrizes deviations from general relativity in this theory.

Virgo preprint number VIR-0918C-21, 30 pages, 9 figures; v2 contains some corrections to the mass-radius relations, showing in particular that all equations of state converge at high densities

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• Quasibound States, Stability and Wave Functions of the Test Fields in the Consistent 4D Einstein-Gauss-Bonnet Gravity
• Quark stars with a unified interacting equation of state in regularized 4D Einstein-Gauss-Bonnet gravity
• Compact objects of spherical symmetry in beyond Horndeski theories
• Conformally coupled theories and their deformed compact objects: from black holes, radiating spacetimes to eternal wormholes
• Rotating black holes in semiclassical gravity
• Linear perturbations of Einstein-Gauss-Bonnet black holes
• Neutron stars in 4D Einstein-Gauss-Bonnet gravity
• Exact black holes in string-inspired Euler-Heisenberg theory
• Thermodynamics of black holes featuring primary scalar hair
• Proca theory of four-dimensional regularized Gauss-Bonnet gravity and black holes with primary hair
• Selecting Horndeski theories without apparent symmetries and their black hole solutions
• Conformally coupled scalar in Lovelock theory
• Cosmological Constraints on 4-Dimensional Einstein-Gauss-Bonnet Gravity
• White dwarfs in regularized 4D Einstein-Gauss-Bonnet gravity
• Non-linear charged planar black holes in four-dimensional Scalar-Gauss-Bonnet theories
• Black hole minimum size and scalar charge in shift-symmetric theories
• Generalized Lense--Thirring metrics: higher-curvature corrections and solutions with matter
• Global conformal symmetry in scalar-tensor theories
• Observational Feasibility of 4D Einstein-Gauss-Bonnet Cosmology: Bouncing and Non-Bouncing Universes
• Slowly Rotating Black Holes in 4D Einstein Gauss-Bonnet Gravity
• Probing supermassive black hole scalarization with Pulsar Timing Arrays
• Theoretical filters for shift-symmetric Horndeski gravities
• Stellar modeling within regularized 4D Einstein-Gauss-Bonnet gravity in light of current astrophysical constraints
• A Brief Thermodynamic Study For Four Dimensional Einstein Gauss Bonnet Black Holes Using Fractalised Barrow Entropy
• New brane-like solutions in modified four-dimensional Einstein-Gauss-Bonnet gravity