38 citations · 56 across the 9 of their papers we have counts for
11 papers
Optical Signatures of Black Holes Surrounded by a Generalized Cloud of Strings
Marcos V. de S. Silva, Ednaldo L. B. Junior, Carlos F. S. Pereira +1
In this work, we investigate the optical signatures of black holes surrounded by a generalized cloud of strings, described by the Letelier--Alencar spacetime. We first analyze null…
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…
Field Sources for Wormholes With Multiple Throats/Anti-throats
T. M. Crispim, Marcos V. de S. Silva, G. Alencar +2
In this work, we investigate wormhole geometries with multiple throats and anti-throats in general relativity. The existence of these structures is identified through the analysis…
Exponential gravity with logarithmic corrections in the presence of axion dark matter
Sergei D. Odintsov, Diego Sáez-Chillón Gómez, German S. Sharov
An exponential modified gravity with additional logarithmic corrections is considered with the presence of an axion-like scalar field in the role of dark matter. Axion fields are t…
On black bounce space-times in non-linear electrodynamics
G. Alencar, Kirill A. Bronnikov, Manuel E. Rodrigues +2
One of the main issues in gravitation is the presence of singularities in the most common space-time solutions of General Relativity, as the case of black holes. A way of construct…
Exponential F(R) gravity with axion dark matter
Sergei D. Odintsov, Diego Sáez-Chillón Gómez, German S. Sharov
The cosmological evolution within the framework of exponential gravity is analysed by assuming two forms for dark matter: (a) a standard dust-like fluid and (b) an axion sca…
Regularizing Rotating Black Strings: a new black bounce solution
A. Lima, G. Alencar, Diego Sáez-Chillon Gómez
The present paper is devoted to a new black bounce solution that regularize the well-known rotating black string in dimensions. To do so, the procedure pointed out by Simpson…
Unifying inflation with early and late dark energy in Einstein-Gauss-Bonnet gravity
Shin'ichi Nojiri, Sergei D. Odintsov, Diego Sáez-Chillón Gómez
In the era of precision cosmology, different observational data has led to precise measurements of the Hubble constant that differ significantly, what has been called the Hubble te…
Multi-ring images of thin accretion disk of a regular naked compact object
Merce Guerrero, Gonzalo J. Olmo, Diego Rubiera-Garcia +1
We discuss the importance of multi-ring images in the optical appearance of a horizonless spherically symmetric compact object, when illuminated by an optically thin accretion disk…
Light ring images of double photon spheres in black hole and wormhole space-times
Merce Guerrero, Gonzalo J. Olmo, Diego Rubiera-Garcia +1
The silhouette of a black hole having a critical curve (an unstable bound photon orbit) when illuminated by an optically thin accretion disk whose emission is confined to the equat…
3+1 decomposition in modified gravities within the Palatini formalism and some applications
Diego Sáez-Chillón Gómez
In the present paper, the 3+1 decomposition of the spacetime onto hypersurface(s) is analysed and established for theories within the Palatini formalism by considering a general fu…