83 citations · 350 across the 34 of their papers we have counts for
22 papers · 1 filter
Static Black Holes and Iyer-Wald Entropy in Gravity
I. Díaz-Saldaña, J. López-Domínguez, Wilfredo Yupanqui +2
We investigate static, spherically symmetric black hole solutions in a class of higher-curvature gravitational theories described by a Lagrangian that depends on the Ricci and Kret…
Strong lensing by GUP-improved black holes
Javier Chagoya, I. Díaz-Saldaña, Benito Rodríguez +1
We employ Bozza's method to calculate the deflection angle of light in the presence of the strong gravitational field generated by an improved Schwarzschild-like black hole whose m…
Compact stars in Einstein-scalar-Gauss-Bonnet gravity: regular and divergent scalar field configurations
Roberto D. Alba Q., Javier Chagoya, Armando A. Roque
We investigate static, spherically symmetric solutions in Einstein-scalar-Gauss-Bonnet gravity non-minimally coupled to a massless real scalar field, both in vacuum and in the pres…
Boundary terms in cosmology
Ángel Cuevas, Javier Chagoya, C. Ortiz
In the derivation of the Einstein field equations via Hamilton's principle, the inclusion of a boundary term is essential to render the variational problem well-posed, as it addres…
Signatures of cubic gravity in the strong regime
Flavio C. Sánchez, Armando A. Roque, Javier Chagoya
We investigate the effects of Einsteinian cubic gravity in the strong gravitational regime. In the first part, we explore analytical solutions for a static, spherically symmetric m…
Observational constraints on entropic cosmology
Javier Chagoya, I. Díaz-Saldaña, Mario H. Amante +2
In this work, we derive a generalized modified Friedmann equation based on an entropy-area relation that incorporates established modifications, such as volumetric, linear, and log…
Stability analysis of geodesics in dynamical Chern-Simons black holes: a geometrical perspective
Tonatiuh Tiscareño, Benito Rodríguez, Javier Chagoya
We apply the Kosambi-Cartan-Chern theory to perform an extensive examination of Jacobi stability of geodesics around rotating black hole solutions to dynamical Chern-Simons gravity…
Shadows of black holes in dynamical Chern-Simons modified gravity
Benito Rodríguez, Javier Chagoya, C. Ortiz
We revisit and extend the study of null geodesics around a slowly rotating black hole in Chern-Simons modified gravity. We employ the Hamilton-Jacobi formalism to derive the equati…
Constraining modified gravity models through strong lensing cosmography
Mario H. Amante, Andrés Lizardo, Javier Chagoya +1
We analyze cosmography as a tool to constrain modified gravity theories. We take four distinct models and obtain their parameters in terms of the cosmographic parameters favored by…
On the entropy of a stealth vector-tensor black hole
Javier Chagoya, I. Díaz-Saldaña, J. C. López-Domínguez +1
We apply Wald's formalism to a Lagrangian within generalised Proca gravity that admits a Schwarzschild black hole with a non-trivial vector field. The resulting entropy differs fro…
Total light bending in non-asymptotically flat black hole spacetimes
Flavio C. Sánchez, Armando A. Roque, Benito Rodríguez +1
The gravitational deflection of light is a critical test of modified theories of gravity. A few years ago, Gibbons and Werner introduced a definition of the deflection angle based…
Cosmic acceleration in entropic cosmology
Javier Chagoya, I. Díaz-Saldaña, J. C. López-Domínguez +1
In this paper we study the viability of an entropic cosmological model. The effects of entropic gravity are derived from a modified entropy-area relationship with a volumetric entr…
Cosmological fluids in the equivalence between Rastall and Einstein gravity
Javier Chagoya, López-Domínguez, C. Ortiz
Rastall gravity is a modified gravity proposal that incorporates a non-conserved energy momentum tensor (EMT). We study the equivalence between Rastall gravity and general relativi…
Vector-tensor gravity from a broken gauge symmetry
Javier Chagoya, M. Sabido, A. Silva-García
In this paper we present a Yang-Mills type gauge theory of vector-tensor gravity, where the tetrad, the spin connection and vector field are identified with components of the gauge…
Horndeski stars
Juan Barranco, Javier Chagoya, Alberto Diez-Tejedor +2
We establish the existence of time-dependent solitons in a modified gravity framework, which is defined by the low energy limit of theories with a weakly broken galileon symmetry a…
On phenomenological parametrizations for the luminosity distance of gravitational waves
Andrés Lizardo, Javier Chagoya, C. Ortiz
The propagation of gravitational waves offers new possibilities for testing the theory of gravity. Amongst these possibilities there is the luminosity distance of gravitational wav…
Strong lensing by DHOST black holes
Javier Chagoya, C. Ortiz, Benito Rodríguez +1
The deflection of light in the strong field limit is an important test for alternative theories of gravity. However, solutions for the metric that allow for analytic computations a…
Compact objects in unimodular gravity
J. A. Astorga-Moreno, Javier Chagoya, J. C. Flores-Urbina +1
Unimodular gravity provides a theoretical framework that allows for non-conservation of energy-momentum, with possible implications for the cosmological constant problem. It is the…
Compact objects in scalar-tensor theories after GW170817
Javier Chagoya, Gianmassimo Tasinato
The recent observations of neutron star mergers have changed our perspective on scalar- tensor theories of gravity, favouring models where gravitational waves travel at the speed o…
Black Holes and Neutron Stars in Vector Galileons
Javier Chagoya, Gustavo Niz, Gianmassimo Tasinato
The direct detection of gravitational waves opens new perspectives for measuring properties of gravitationally bound compact objects. It is then important to investigate black hole…
Self-Dual Gravity and the Immirzi parameter
Javier Chagoya, M. Sabido
Working in the first order formalism of gravity, we propose an action that combines the self and anti-self-dual parts of the curvature and comprises all the diffeomorphism invarian…
Anistropic Invariant FRW Cosmology
J. F. Chagoya, M. Sabido
In this paper we study the effects of including anisotropic scaling invariance in the minisuperspace Lagrangian for a universe modelled by the Friedman-Robertson-Walker metric, a m…