Horizons, throats and bounces in hybrid metric-Palatini gravity with a non-zero potential

Abstract

This work conducts an in-depth exploration of exact electrically charged solutions, including traversable wormholes, black holes, and black bounces, within the framework of the scalar-tensor representation of hybrid metric-Palatini gravity (HMPG) with a non-zero scalar potential. By integrating principles from both the metric and Palatini formulations, HMPG provides a flexible approach to addressing persistent challenges in General Relativity (GR), such as the late-time cosmic acceleration and the nature of dark matter. Under the assumption of spherical symmetry, we employ an inverse problem technique to derive exact solutions in both the Jordan and Einstein conformal frames. This method naturally leads to configurations involving either canonical or phantom scalar fields. A thorough examination of horizon structures, throat conditions, asymptotic behaviour, and curvature regularity (via the Kretschmann scalar) reveals the intricate causal structures permitted by this theoretical model. The analysis uncovers a diverse range of geometric configurations, with the phantom sector exhibiting a notably richer spectrum of solutions than the canonical case. These solutions encompass traversable wormholes, black universe models, where the interior of a black hole evolves into an expanding cosmological phase rather than a singularity, as well as black bounce structures and multi-horizon black holes. The results demonstrate that introducing a non-zero scalar potential within HMPG significantly expands the array of possible gravitational solutions, yielding complex causal and curvature properties that go beyond standard GR. Consequently, HMPG stands out as a powerful theoretical framework for modelling extreme astrophysical environments, where deviations from classical gravity are expected to play a crucial role.

34 pages, 13 figures. V2: 38 pages 15 figures. Discussion, references and Appendix added. Accepted for publication in JCAP

References in corpus (29)

• First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way
• First M87 Event Horizon Telescope Results. VIII. Magnetic Field Structure near The Event Horizon
• First M87 Event Horizon Telescope Results. VII. Polarization of the Ring
• Construction of Regular Black Holes in General Relativity
• First Sagittarius A* Event Horizon Telescope Results. II. EHT and Multi-wavelength Observations, Data Processing, and Calibration
• Novel black-bounce spacetimes: wormholes, regularity, energy conditions, and causal structure
• Regular black holes and black universes
• Cosmology of hybrid metric-Palatini f(X)-gravity
• Vaidya spacetimes, black-bounces, and traversable wormholes
• Phantom Black Holes in Einstein-Maxwell-Dilaton Theory
• Dynamic thin-shell black-bounce traversable wormholes
• First M87 Event Horizon Telescope Results. IX. Detection of Near-horizon Circular Polarization
• Beyond Einstein's General Relativity: Hybrid metric-Palatini gravity and curvature-matter couplings
• Source of black bounces in general relativity
• Coincident f(Q) gravity: black holes, regular black holes and black bounces
• (Regular) Black holes in conformal Killing gravity coupled to nonlinear electrodynamics and scalar fields
• Double gravitational layer traversable wormholes in hybrid metric-Palatini gravity
• On black bounce space-times in non-linear electrodynamics
• Regular multihorizon black holes in $f(G)$ gravity with nonlinear electrodynamics
• Black bounces in conformal Killing gravity
• Black-Bounce in $f(T)$ Gravity
• Black Bounces with multiple throats and anti-throats
• Generalized models for black-bounce solutions in $f(R)$ Gravity
• Hybrid metric-Palatini gravity: black holes, wormholes, singularities and instabilities
• Black holes and regular black holes in coincident $f(\mathbb{Q},{\mathbb{B}}_Q)$ gravity coupled to nonlinear electrodynamics
• Regular multihorizon black holes in General Relativity
• Black bounces in Cotton gravity
• Spherically symmetric space-times in generalized hybrid metric-Palatini gravity
• On the stability of electrovacuum space-times in scalar-tensor gravity

Cited by in corpus (1)

• Images of the accretion disk in Hybrid metric-Palatini gravity