362 citations · 5.2k across the 125 of their papers we have counts for
126 papers
Conformally Interacting Dark Energy with Early and Late-Time Measurements
Shambel Sahlu, Abunie Gezahegn, Amare Abebe +2
The conformal interacting dark energy (CIDE) model is investigated by introducing a scalar field representing dark energy (DE) coupled to dark matter (DM) via a conformal transform…
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…
A Four-Dimensional Gaussian Random Field Generator for Modeling Spatiotemporal Variability in Astrophysical Sources
Alejandro Cárdenas-Avendaño, Diego Rubiera-Garcia, Frederic H. Vincent
Semi-analytic models of black-hole movies require both an emitting flow prescription and a time-dependent source variability. Existing prescriptions are often limited to either equ…
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…
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…
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…
Light trajectories and optical appearances in asymptotically Anti-de Sitter-Schwarzschild and black string space-times
G. Alencar, Arthur Lima, Diego Rubiera-Garcia +1
The Event Horizon Telescope (EHT) imaging of the central objects in the M87 and Milky Way galaxies provide compelling evidence that these objects are consistent with (Kerr) black h…
Twinkle twinkle dark star: Oscillating profiles from dark matter scalar solitons
Nicolas Aimar, Caio F. B. Macedo, João Luís Rosa +1
Real scalar fields, e.g. the axion, cannot condensate into stationary solitonic configurations to form starlike structures, eventually either dispersing or collapsing. However, by…
Matter environments around black holes: geodesics, light rings, and ultracompact configurations
Dylan S. Fonseca, Caio F. B. Macedo, Mateus Malato Corrêa +1
Astrophysical black holes are invariably embedded in matter environments whose gravitational influence can alter key strong-field features of the spacetime. In this work, we invest…
Observational appearance and photon rings of non-singular black holes from anisotropic fluids
David Díaz-Guerra, Angel Rincon, Diego Rubiera-Garcia
We consider the optical appearance of a non-singular, spherically symmetric black hole from Eddington-inspired Born-Infeld gravity coupled to anisotropic fluids. Such a black hole…
Multi-photon ring structure of reflection-asymmetric traversable thin-shell wormholes
Caio F. B. Macedo, João Luís Rosa, Diego Rubiera-Garcia +1
We consider the observational signatures of thin accretion disks around a reflection-asymmetric traversable thin-shell wormhole. This wormhole, built in the framework of Palatini $…
Astrometric and polarimetric imprints of hot-spots orbiting parametrized black holes
João Luís Rosa, Nicolas Aimar, Diego Rubiera-Garcia
We analyze the observational features of hot-spots orbiting parametrized black hole (BH) spacetimes. We select a total of four BH spacetimes, two from the Johanssen-Psaltis (JP) pa…
Accretion dynamics in black holes with spontaneous Lorentz symmetry breaking
Daniela S. J. Cordeiro, Ednaldo L. B. Junior, José Tarciso S. S. Junior +6
We investigate the spherical accretion of various types of fluids onto a Schwarzschild-like black hole solution modified by a Kalb-Ramond field implementing spontaneous Lorentz sym…
Shadows from thin accretion disks of parametrized black hole solutions
Gonzalo J. Olmo, João Luís Rosa, Diego Rubiera-Garcia +2
We discuss the optical appearance from thin accretion disks in parametrized black holes, namely, solutions characterized by an arbitrarily large number of parameters without any re…
Resolving space-time singularities in spherically symmetric black holes: geodesic completeness, curvature scalars, and tidal forces
Haroldo C. D. Lima Junior, Renan B. Magalhães, Gonzalo J. Olmo +1
The existence of black holes in the Universe is nowadays established on the grounds of a blench of astrophysical observations, most notably those of gravitational waves from binary…
Quasi-normal modes and echoes of generalized black hole bounces and their correspondence with shadows
Albert Duran-Cabacés, Diego Rubiera-Garcia, Diego Sáez-Chillón Gómez
We study the quasi-normal modes (QNMs) of a family of generalized black bounces interpolating between regular black holes and traversable wormhole solutions according to a single e…
Quasi-normal modes and shadows of scale-dependent regular black holes
Benjamin Koch, Gonzalo J. Olmo, Ali Riahinia +2
In this paper we investigate how a regular scale-dependent black hole, characterized by a single extra parameter , behaves under perturbations by a test field (quasi-normal mode…
The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
Eleonora Di Valentino, Jackson Levi Said, Adam Riess +533
The standard model of cosmology has provided a good phenomenological description of a wide range of observations both at astrophysical and cosmological scales for several decades.…
The Science of the Einstein Telescope
Adrian Abac, Raul Abramo, Simone Albanesi +485
Einstein Telescope (ET) is the European project for a gravitational-wave (GW) observatory of third-generation. In this paper we present a comprehensive discussion of its science ob…
Free-falling test particles in a charged Kalb-Ramond black hole: gravitational Doppler effect and tidal forces
Daniela S. J. Cordeiro, Ednaldo L. B. Junior, José Tarciso S. S. Junior +5
Space-times exhibiting spontaneous Lorentz symmetry-breaking have recently attracted much attention, with Kalb-Ramond (KR) gravity providing a notable example. In this context, we…
General spherically symmetric black bounces within non-linear electrodynamics
G. Alencar, Albert Duran-Cabacés, Diego Rubiera-Garcia +1
Over the last years, the search of new regular black bounce solutions has drawn a lot of attentional over the international community working in gravitation. Indeed, in the era of…
Periodical orbits and waveforms with spontaneous Lorentz symmetry-breaking in Kalb-Ramond gravity
Ednaldo L. B. Junior, José Tarciso S. S. Junior, Francisco S. N. Lobo +4
In this paper, we study time-like geodesics around a spherically symmetric black hole in Kalb-Ramond (KR) gravity, characterized by the parameter , which induces spontaneous Lor…
Gravitational lensing and shadows from thin-disks in Loop Quantum Gravity self-dual black holes
David J. Patiño Pomares, Diego Rubiera-Garcia
We analyze gravitational lensing and their cast images from thin-disks in shadow observations of a family of spherically symmetric black hole solutions previously derived within th…
Stellar structure in gravity: some exact solutions
Aliya Batool, Abdul Malik Sultan, Gonzalo J. Olmo +1
We find some exact solutions for constant-density and quark matter equations of state in stellar structure models framed within the theory of gravity, where i…