42 citations · 284 across the 45 of their papers we have counts for
52 papers
Excess inner-horizon entropy and the thermodynamics of Kerr formation
Francisco S. N. Lobo, Jorge Ovalle, Manuel E. Rodrigues
\noindent We develop a charge-matched thermodynamic framework for the regular rotating black-hole family underlying an exact model of Kerr formation. Since the Kerr endpoint alread…
Thin-shell wormholes from magnetic black holes in exponential electrodynamics
Jonathan A. Rebouças, Edson Otoniel, Muhammad Israr Aslam +1
Transparent magnetic wormholes can share a black hole exterior while their supporting matter controls the response of the throat. We construct symmetric thin shells from the magnet…
Local obstructions to trapped-region escape in modified gravity
Francisco S. N. Lobo
Energy conditions in modified gravity are commonly imposed on an ''effective'' stress tensor that mixes physical matter with additional gravitational degrees of freedom, obscuring…
Intrinsic spatial-strain shortcuts in general relativity
Francisco S. N. Lobo
We analyze spacetime shortcuts generated by longitudinal contraction and transverse expansion of the intrinsic spatial metric at fixed reference volume. Smooth bounded ultrastatic…
Stochastic Thermodynamics of Dynamical Thin-Shell Wormholes: Effective Temperatures, Fluctuations and Conditional Quasi-Horizon Unification
Francisco S. N. Lobo, Manuel E. Rodrigues
We develop an effective stochastic and semiclassical framework for dynamical thin-shell wormholes connecting two asymptotic spacetime regions. The Israel junction geometry is separ…
Accretion dynamics of thin and thick disks in charged Kalb-Ramond black holes
Ednaldo L. B. Junior, José Tarciso S. S. Junior, Francisco S. N. Lobo +5
In this work, we investigate the accretion properties of an electrically charged, static, spherically symmetric black hole in Kalb-Ramond (KR) gravity, where a dimensionless parame…
Thin-shell wormholes in cosmic voids
Jonathan A. Rebouças, Edson Otoniel, Francisco S. N. Lobo
Cosmic voids are underdense regions that can provide an effective large-scale environment with a de Sitter-like gravitational behavior. Motivated by recent black-hole solutions emb…
A general static and spherically symmetric black hole in traceless metric-affine bumblebee gravity
A. A. Araújo Filho, N. Heidari, V. B. Bezerra +1
We construct and analyze a general exact static and spherically symmetric black hole solution in traceless metric-affine bumblebee gravity by considering a vacuum expectation value…
Mass inflation or scalaron rigidity: Cauchy horizons in metric f(R)
Francisco S. N. Lobo, Maickol Muñoz-Palma, Francisco Tello-Ortiz
We develop a double-null framework for Cauchy-horizon dynamics in metric gravity that separates ordinary mass inflation from scalaron cancellation and genuine escape from th…
Horizon-regular cross-focusing and inner-horizon obstructions in spherical f(R) gravity
Maickol Muñoz-Palma, Francisco S. N. Lobo, Jean Báez Cuevas +1
We formulate a horizon-regular double-null criterion for regular inner marginal horizons in spherically symmetric metric gravity. Using normalized outgoing and ingoing radia…
Scalaron-modified null focusing and radial monotonicity in static f(R) gravity
Maickol Muñoz-Palma, Francisco S. N. Lobo, Jean Báez Cuevas +1
We derive an exact radial monotonicity law for static, spherically symmetric spacetimes in metric \(f(R)\) gravity. For \(ds^2=A(r)dt^2-dr^2/B(r)-r^2dΩ^2\), the matter contribution…
Black bounce sourced by non-minimally coupled linear electrodynamics and a canonical scalar field through a thin shell at the throat
Ednaldo L. B. Junior, José Tarciso S. S. Junior, Francisco S. N. Lobo +5
We construct a novel class of black bounce solutions within General Relativity, sourced by a canonical scalar field non-minimally coupled to linear electrodynamics, establishing a…
Entropy dynamics in gravitational collapse: From Minkowski breaking to de Sitter thermodynamics
Francisco S. N. Lobo, Manuel E. Rodrigues
The origin of black hole entropy remains one of the deepest mysteries in modern physics. Two recent developments offer complementary perspectives on this puzzle: the entropy releas…
Entropy release from Minkowski breaking in regular Schwarzschild black holes
Francisco S. N. Lobo, Manuel E. Rodrigues
The classical formation of a Schwarzschild black hole from a regular, non-singular configuration has recently been shown to be impossible within general relativity: the geometry in…
Generalized Unruh temperature for dynamical thin-shell wormholes
Francisco S. N. Lobo, Manuel E. Rodrigues
We unify two independent notions of effective temperature in dynamical thin-shell wormholes: the local acceleration temperature of the throat and the Hawking-like particle-creation…
Thermodynamics of thin-shell wormholes
Francisco S. N. Lobo, Manuel E. Rodrigues
We develop a unified thermodynamic description of dynamic thin-shell wormholes, starting from the transparent (vacuum bulk) case and then relaxing the transparency condition to inc…
Black bounce solutions in a realistic dark matter halo from M60*
Ednaldo L. B. Junior, José Tarciso S. S. Junior, Francisco S. N. Lobo +5
We formulate a Simpson-Visser black bounce solution embedded in a dark matter halo. The latter is modeled using an empirical density profile calibrated from observations of the ell…
Linearized stability of T-duality quantum-inspired thin-shell wormholes
Francisco S. N. Lobo, Manuel E. Rodrigues
Wormholes that are traversable in principle offer fascinating insights into general relativity, yet they typically require exotic matter and suffer from stability issues. We constr…
Black Bounce Solutions from a Self-Interacting 3-Form Field in General Relativity
Francisco S. N. Lobo, Manuel E. Rodrigues
We construct a new class of black-bounce solutions sourced by a self-interacting 3-form field minimally coupled to general relativity and a scalar field. The 3-form field, which na…
Lorentz-violating signatures in quasi-periodic oscillations from a magnetised Kalb-Ramond black hole
Luiz F. G. Rodrigues, Francisco S. N. Lobo, Manuel E. Rodrigues
We investigate the dynamics of charged particles around a Schwarzschild-like black hole sourced by a Kalb-Ramond field and immersed in a uniform external magnetic field. The Kalb-R…
A regularized photon-pair geometry motivated by the ER=EPR conjecture
Kimet Jusufi, Francisco S. N. Lobo, Douglas Singleton
We regularize the Aichelburg-Sexl shock-wave geometry for massless particles by smearing the point-like source over a string-inspired length scale . A radial extension of the…
Scalar-Electromagnetic Couplings as Source of Deformed Black Hole: From Shadows to Thermodynamic Topology
Ednaldo L. B. Junior, José Tarciso S. S. Junior, Francisco S. N. Lobo +5
We reconstruct a static and spherically symmetric black hole geometry originally proposed as an effective metric by identifying a consistent matter source derived from a fundamenta…
Dyonic Ellis-Bronnikov wormholes from warped extra dimensions
Francisco S. N. Lobo, Miguel A. S. Pinto, Manuel E. Rodrigues
We investigate traversable wormhole solutions within a four-dimensional effective theory derived from a five-dimensional Einstein-Maxwell-Chern-Simons action with a non-minimally c…
Regular Black Holes in General Relativity from Nonlinear Electrodynamics with de Sitter Cores
A. A. Araújo Filho, Ednaldo L. B. Junior, José Tarciso S. S. Junior +6
We present new regular black hole solutions in general relativity (GR) within a static, spherically symmetric framework governed by a variable equation of state, following the appr…