Browsing by Author "Rincon, Angel"

Now showing 1 - 7 of 7
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    A general interior anisotropic solution for a BTZ vacuum in the context of the minimal geometric deformation decoupling approach
    (2019) Contreras, Ernesto; Rincon, Angel; Bargueno, Pedro
    In this work we implement the Minimal Geometric Deformation decoupling method to obtain general static interior solutions for a BTZ vacuum from the most general isotropic solution in 2+1 dimensions including the cosmological constant . We obtain that the general solution can be generated only by the energy density of the original isotropic sector, so that this quantity plays the role of a generating function. Although as a particular example we study the static star with constant density, the method here developed can be easily applied to more complex situations described by other energy density profiles.
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    A universe from a Lagrangian fixed point
    (2024) Alvarez, Pedro D.; Koch, Benjamin; Riahinia, Ali; Rincon, Angel
    In this paper, we investigate the theoretical possibility that a Lagrangian fixed point, when applied to cosmological models, can drive dynamical evolution towards a bouncing universe. We analyze the physics of a Lagrangian fixed point within the context of a gravitational average effective action featuring scale-dependent couplings. To explore this concept, we develop a toy model set in a four-dimensional, spatially flat spacetime, anchored by a Lagrangian fixed point. Solving the cosmological equations of this model analytically, we identify several non-trivial solution branches. These branches are characterized by a modified scale factor and dynamic gravitational couplings, offering new insights into the behavior of cosmological models under these conditions.
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    Can scale-dependent cosmology alleviate the H0 tension?
    (2021) Alvarez, Pedro D.; Koch, Benjamin; Laporte, Cristobal; Rincon, Angel
    Scale-dependence is a common feature to all effective models of quantum gravity. In this paper, a cosmological model based on the scale-dependent scenario of gravity is presented. It is argued that such models, where the scale-dependence appears as a correction to the classical Lambda CDM evolution, have the potential of addressing the tensions between early and late time measurements of H-0. After defining criteria to parametrize this tension, we perform a numerical scan over the parameter space of the scale-dependent model, subject to these criteria. In this analysis, it is found that, indeed, the tension can be released.
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    Four dimensional Einstein-power-Maxwell black hole solutions in scale-dependent gravity
    (2021) Rincon, Angel; Contreras, Ernesto; Bargueno, Pedro; Koch, Benjamin; Panotopoulos, Grigoris
    In the present work, we extend and generalize our previous work regarding the scale dependence applied to black holes in the presence of non-linear electrodynamics (Rincon et al., 2017). The starting point for this study is the Einstein-power-Maxwell theory with a vanishing cosmological constant in (3+1) dimensions, assuming a scale dependence of both the gravitational and the electromagnetic coupling. We further examine the corresponding thermodynamic properties and how these quantities experience deviations from their classical counterparts. We solve the effective Einstein's field equations using the "null energy condition'' to obtain analytical solutions. The implications of quantum corrections are also briefly discussed. Finally, we analyze our solutions and compare them to related results in the literature. (C) 2021 Elsevier B.V. All rights reserved.
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    Observational constraints on scale-dependent cosmology
    (2024) Alvarez, Pedro D.; Koch, Benjamin; Laporte, Cristobal; Rincon, Angel
    This paper examines a cosmological model of scale-dependent gravity. The gravitational action is taken to be the Einstein-Hilbert term supplemented with a cosmological constant, where the couplings, G k and A k , run with the energy scale k. Also, notice that, by construction, our formalism recovers general relativity when in the limit of constant Newton's coupling. Two sub-models based on the scale-dependent cosmological model are confronted with recent observational data from: (i) the Hubble parameter H ( z ) , (ii) distance modulus mu ( z ) and (iii) baryon acoustic scale evolution as functions of redshift (BAO). The viability of the model is discussed, obtaining the best-fit parameters and the maximum likelihood contours for these observables. Finally, a joint analysis is performed for H ( z )+ mu ( z )+ BAO.
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    Relativistic dust accretion onto a scale-dependent polytropic black hole
    (2019) Contreras, Ernesto; Rincon, Angel; Ramirez-Velasquez, J. M.
    In this work we study steady and spherical relativistic dust accretion onto a static and spherically symmetric scale-dependent black hole. In particular we consider a polytropic scale-dependent black hole as a central object and obtain that the radial velocity profile and the energy density are affected when scale-dependence of the central object is taken into account and such a deviation is controlled by the so called running parameters of the scale-dependence models.
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    Statefinder analysis of scale-dependent cosmology
    (2022) Alvarez, Pedro D.; Koch, Benjamin; Laporte, Cristobal; Canales, Felipe; Rincon, Angel
    We study the statefinder parameters of a cosmological model based on scale -dependent gravity. The effective Einstein field equations come from an average effective action. From the dynamical system, we derive analytical expressions that improve the con-vergence of the numerical solutions. We determine the statefinder parameters for moderate redshift and compare them with well-known alternatives to ACDM.