94 citations · 950 across the 111 of their papers we have counts for
19 papers · 1 filter
Non-Stationary Wormholes and Matter Source Reconstruction in General Relativity
Geová Alencar, Tiago Crispim, Roberta Dárlla +1
We investigate non-stationary wormhole geometries in General Relativity embedded in evolving cosmological backgrounds. We employ a Simpson-Visser-like regularization of the tempora…
Deriving Schwarzschild and Kerr from the Einstein Equivalence Principle
G. Alencar
This manuscript demonstrates that the Schwarzschild and Kerr metrics can be derived fundamentally from the Einstein Equivalence Principle (EEP) without explicit reliance on the Ein…
From massless wormholes to massive black bounces: Shadows and multiple light rings
G. Alencar, Kirill A. Bronnikov, T. M. Crispim +2
We develop a general framework for constructing massive black bounce geometries from massless wormhole seeds by introducing a position-dependent mass function while preserving the…
Electrically Charged Non-Abelian Black String in Anti-de Sitter Space
G. Alencar, R. N. Costa Filho, I. Jardim +1
We construct a new family of static, electrically charged, cylindrically symmetric black-string solutions of four-dimensional Einstein--Yang--Mills theory with a negative cosmologi…
Analyzing Quasi-normal modes spectrum in asymptotically de Sitter black bounces and their optical appearance
G. Alencar, Albert Duran-Cabacés, A. Lima +2
This work explores asymptotically de Sitter black-bounce spacetimes, obtained as a regular extension of the Schwarzschild-de Sitter geometry via the Simpson-Visser prescription. Th…
Geometrically Regular Black Object Solutions in Lower-Dimensional Gauss-Bonnet Gravity and Its Unimodular Extension
G. Alencar, T. M. Crispim, C. R. Muniz
We investigate the construction of regular compact objects in the recently proposed lower-dimensional Einstein--Gauss--Bonnet (EGB) gravity obtained through regularized dimensional…
Field Sources for Dark Matter Black Holes
G. Alencar, C. R. Muniz, Francisco Tello-Ortiz
We investigate the field-theoretic realization of regular black holes sourced by dark matter halo profiles within nonlinear electrodynamics (NED) minimally coupled to gravity. Star…
Horizon formation from effective matter profiles in static spacetimes
Pablo León, G. Alencar, Manuel Gonzalez-Espinoza +1
The formation of event horizons is traditionally studied as the endpoint of gravitational collapse, where the matter distribution and the spacetime geometry are evolved simultaneou…
Dymnikova Black Holes in Unimodular Gravity: Maxwell Sources and Vacuum Contributions
G. Alencar, V. H. U. Borralho
In this work, we investigate the Dymnikova regular black hole within the framework of unimodular gravity, emphasizing the role of the effective vacuum sector in the regularization…
Regular Black Strings and Black Hole in Unimodular Gravity Supported by Maxwell Fields
G. Alencar, V. H. U. Borralho
In this work, we obtain regular solutions with a dynamical cosmological function in unimodular gravity. This alternative theory to General Relativity imposes an additional conditio…
New Improved Schwarzschild Black Hole and Its Thermodynamics and Topological Classification
G. Alencar, T. M. Crispim, C. R. Muniz +1
We construct a renormalization-group improved Schwarzschild-like black hole geometry using the exact new scheme running for the Newton coupling. The scale identification is impleme…
Black bounce as a quantum correction from string T-duality: Thermodynamics, energy conditions, and observational imprints from EHT
G. Alencar, T. M. Crispim, Diego Sáez-Chillón Gómez +1
Motivated by quantum gravity effects suggested by string theory, we investigate gravitational configurations sourced by an effective energy density inspired by T-duality. This dens…
Lower-dimensional Gauss-Bonnet gravity black holes with quintessence
G. Alencar, T. M. Crispim, J. Macedo +1
In this paper, we study the limit of Gauss-Bonnet gravity with quintessential matter, obtaining exact solutions that extend the BTZ metric through higher-curvature terms an…
The scalar--Maxwell-- system: Wormhole spacetimes without nonlinear electrodynamics in unimodular gravity
G. Alencar, T. M. Crispim
In General Relativity, supporting known traversable wormhole geometries with electromagnetic fields typically requires complex Non-Linear Electrodynamics (NED). We demonstrate that…
On regular black string spacetimes in nonlinear electrodynamics
G. Alencar, V. H. U. Borralho, T. M. Crispim +1
In this work, we investigate the coupling of General Relativity with Nonlinear Electrodynamics (NED), governed by a general Lagrangian , to address the ax…
Cylindrically Symmetric Black Holes Sourced by Dekel-Zhao Dark Matter
G. Alencar, V. H. U. Borralho, M. S. Cunha +1
In this work, we obtain analytical solutions for a -dimensional black string and a -dimensional black hole, both sourced by the Dekel-Zhao dark matter (DM) density pr…
Classical double copy of black strings in an Anti-de Sitter background
G. Alencar, C. R. Muniz, M. S. Oliveira
We study the classical double copy for static black string solutions in an Anti--de Sitter (AdS) background. By casting the black string metric into Kerr--Schild form over a cylind…
Embedding Wormholes and Dyonic Black Strings in Warped Braneworlds via Local Sum Rules
G. Alencar, T. M. Crispim, Francisco S. N. Lobo
Building on our previous work [1], where the Local Sum Rules (LSR) were established, we investigate the construction of compact objects in Randall-Sundrum braneworlds supported by…
The End of the Road for Bulk Fields in Warped Randall-Sundrum Braneworlds
G. Alencar, R. S. Almeida, R. N. Costa Filho +2
In this manuscript we generalize Ref. [1] and derive a complete set of local consistency conditions for bulk fields in braneworld scenarios with an arbitrary number of dimensions.…