63 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Universidad Diego PortalesCL14 papers
- University of La SerenaCL11 papers
- Centro de Estudios CientíficosCL3 papers
- International Solvay InstitutesBE3 papers
- Durban University of TechnologyZA2 papers
- National Institute for Theoretical PhysicsZA2 papers
- National Technical University of AthensGR2 papers
- Pontificia Universidad Católica de ValparaísoCL2 papers
- Universidad Católica de la Santísima ConcepciónCL2 papers
- Universidad de La FronteraCL2 papers
- Universidad de Los LagosCL2 papers
- Université Libre de BruxellesBE2 papers
22 papers
Unifying the Dark Sector with the New Generalized Chaplygin Gas: Observational Constraints
Abdulla Al Mamon, Andronikos Paliathanasis, Subhajit Saha
In light of recent cosmological observations, we examine a generalized Chaplygin gas model with a redshift-dependent exponent as a framework for describing the dark energy and dark…
Scalar-Tensor Symmetric Teleparallel Gravity: Reconstruct the Cosmological History with a Steep Potential
Ghulam Murtaza, Avik De, Andronikos Paliathanasis
Within the framework of scalar-non-metricity gravity, we introduce a steep potential together with a power-law coupling function and investigate whether the acceleration phases of…
Massive scalar field perturbations of 4D de Sitter Einstein-Gauss-Bonnet black holes
Ramón Bécar, P. A. González, Eleftherios Papantonopoulos +1
We investigate the propagation of massive scalar fields in the background of four-dimensional Einstein-Gauss-Bonnet black holes with de Sitter (dS) asymptotics. Our study focuses o…
AdS Carroll gravity: asymptotic symmetries and C-thermal configurations
Luis Avilés, Oscar Fuentealba, Diego Hidalgo +1
The asymptotic structure of three-dimensional Carroll gravity with negative cosmological constant is studied. We formulate a consistent set of boundary conditions preserved by an i…
Nonlinear automorphism of the conformal algebra in 2D and continuous deformations
David Tempo, Ricardo Troncoso
The conformal algebra in 2D (Diff()Diff()) is shown to be preserved under a nonlinear map that mixes both chiral (holomorphic) generators and . I…
Mapping relativistic to ultra/non-relativistic conformal symmetries in 2D and finite deformations
Pablo Rodríguez, David Tempo, Ricardo Troncoso
The conformal symmetry algebra in 2D (Diff()Diff()) is shown to be related to its ultra/non-relativistic version (BMSGCA) through a nonli…
Hypersymmetric extensions of Maxwell Chern-Simons gravity in (2+1) dimensions
Ricardo Caroca, Patrick Concha, Javier Matulich +2
We present a consistent way of coupling three-dimensional Maxwell Chern-Simons gravity theory with massless spin- gauge fields. We first introduce the simplest hyper-M…
Phase transitions in four-dimensional AdS black holes with a nonlinear electrodynamics source
Ramon Becar, P. A. Gonzalez, Joel Saavedra +2
In this work we consider black hole solutions to Einstein theory coupled to a nonlinear power-law electromagnetic field with a fixed exponent value. We study the extended phase spa…
The (super)conformal BMS algebra
Oscar Fuentealba, Hernan A. Gonzalez, Alfredo Perez +2
The conformal extension of the BMS algebra is constructed. Apart from an infinite number of 'superdilatations,' in order to incorporate 'superspecial conformal transformation…
Massive Dirac quasinormal modes in Schwarzschild-dS black holes: anomalous decay rate and fine structure
Almendra Aragón, Ramón Bécar, P. A. González +1
Recently, the anomalous decay rate of quasinormal modes has been studied for some geometries under scalar field perturbations, which occurs when the longest-lived modes are the one…
Pivot Selection for Median String Problem
Pedro Mirabal, José Abreu, Oscar Pedreira
The Median String Problem is W[1]-Hard under the Levenshtein distance, thus, approximation heuristics are used. Perturbation-based heuristics have been proved to be very competitiv…
Collision of particles near a three-dimensional rotating Hořava AdS black hole
Ramón Bécar, P. A. González, Yerko Vásquez
We consider a three-dimensional rotating Hořava AdS black hole, that corresponds to a Lorentz-violating version of the BTZ black hole and we analyze the effect of the breaking of L…
Quasinormal modes of three-dimensional rotating Hořava AdS black hole and the approach to thermal equilibrium
Ramón Bécar, P. A. González, Eleftherios Papantonopoulos +1
We compute the quasinormal modes (QNMs) of a massive scalar field in the background of a rotating three-dimensional Hořava AdS black hole, and we analyze the effect of the breaking…
Particle collisions near a three-dimensional warped AdS black hole
Ramón Bécar, P. A. González, Yerko Vásquez
In this paper we consider the warped AdS black hole solution of topologically massive gravity with a negative cosmological constant, and we investigate the possibility that i…
Quasinormal modes of Four Dimensional Topological Nonlinear Charged Lifshitz Black Holes
Ramon Becar, P. A. Gonzalez, Yerko Vasquez
We study scalar perturbations of four dimensional topological nonlinear charged Lifshitz black holes with spherical and plane transverse sections, and we find numerically the quasi…
Quasinormal modes of non-Abelian hyperscaling violating Lifshitz black holes
Ramón Bécar, P. A. González, Yerko Vásquez
We study the quasinormal modes of scalar field perturbations in the background of non-Abelian hyperscaling violating Lifshitz black holes. We find that the quasinormal frequencies…
Greybody Factors of Massive Charged Fermionic Fields in a Charged Two-Dimensional Dilatonic Black Hole
Ramon Becar, P. A. Gonzalez, Joel Saavedra +1
We study massive charged fermionic perturbations in the background of a charged two-dimensional dilatonic black hole, and we solve the Dirac equation analytically. Then, we compute…
Dirac quasinormal modes of two-dimensional charged Dilatonic Black Holes
Ramon Becar, P. A. Gonzalez, Y. Vasquez
We study charged fermionic perturbations in the background of two-dimensional charged Dilatonic black holes, and we present the exact Dirac quasinormal modes. Also, we study the st…
Fermionic greybody factors of two and five-dimensional dilatonic black holes
Ramón Becar, P. A. González, Yerko Vásquez
We study fermionic perturbations in the background of a two and five-dimensional dilatonic black holes. Then, we compute the reflection and transmission coefficients and the absorp…
Dirac quasinormal modes of Chern-Simons and BTZ black holes with torsion
Ramon Becar, P. A. Gonzalez, Y. Vasquez
We study Chern-Simons black holes in d-dimensions and we calculate analytically the quasinormal modes of fermionic perturbations. Also, we consider as background the five-dimension…
Quasinormal modes and stability analysis for z=4 Topological black hole in 4+1 dimensional Horava-Lifshitz gravity
Ramon Becar, P. A. Gonzalez, Yerko Vasquez
We study z=4 Topological black hole in 4+1 dimensional Horava-Lifshitz gravity and we calculate analytically the quasinormal modes of scalar perturbations and from these quasinorma…
Hawking Radiation for Scalar and Dirac Fields in Five Dimensional Dilatonic Black Hole via Anomalies
Ramón Becar, P. A. González
We study massive scalar fields and Dirac fields propagating in a five dimensional dilatonic black hole background. We expose that for both fields the physics can be describe by a t…