22 citations · 31 across the 14 of their papers we have counts for
12 papers · 1 filter
Photon-Return and Polar-Focusing Crossovers near Extremal Kerr
Valentina Gonzalez-Moya, Ali Ovgun, Joel Saavedra
How precisely must a photon's impact parameter be tuned for it to complete windings around a nearly extremal Kerr black hole before escaping, and how does the same near extrema…
Does spatial curvature generate new thermodynamic criticality at the FLRW apparent horizon?
Samuel Lepe, Joel Saavedra
We generalize the apparent-horizon thermodynamic construction of [1] to a FLRW universe with non-zero spatial curvature, non-interacting cold dark matter and holographic-type dark…
Redshift Spectroscopy as a Probe of Regular Black Holes, Black Bounces, and Scalar-Hair Compact Objects
Ali Övgün, Reggie C. Pantig, Joel Saavedra
Motivated by [Phys. Rev. D. 107, 064019 (2023)], we develop a unified and model-independent framework for the spectroscopy of photon frequency shifts in generic static, spherically…
Thermodynamic Criticality in FLRW Cosmology with Non-extensive Loop Quantum Gravity Entropy
Miguel Cruz, Joel Saavedra, Juan Rodriguez
We investigate thermodynamic criticality in a spatially flat Friedmann-Lema\^ıtre-Robertson-Walker universe with a non-extensive Loop Quantum Gravity inspired entropy on its appare…
Two-scale magnetically charged regular black holes from nonlinear electrodynamics and a T-duality-inspired zero-point length
Ali Ovgun, Reggie C. Pantig, Joel Saavedra
We construct a two-scale, static, spherically symmetric regular black hole in Einstein gravity sourced by magnetic nonlinear electrodynamics (NED). The zero-point length reg…
The generalized second law as a thermodynamic selection criterion for dynamical dark energy
Marcos H. Cruz, Miguel Cruz, Joel Saavedra +1
The growing number of generalized horizon entropy proposals has led to a wide variety of modified cosmological models, yet there is currently no general physical principle capable…
Cosmological Stealth fields and Non-Equilibrium thermodynamics
Gilberto Aguilar-Pérez, Cuauhtemoc Campuzano, Víctor H. Cárdenas +2
We investigate the connection between cosmological stealth scalar fields and non-equilibrium thermodynamics in a spatially flat Friedmann-Lemaître-Robertson-Walker (FLRW) backgroun…
Scattering, Hawking Radiation and Neutrino Energy Deposition in Euler-Heisenberg Black Holes Surrounded by Perfect Fluid Dark Matter
Ramon Becar, P. A. Gonzalez, Ali Ovgun +2
We study the dynamical and scattering properties for the Euler-Heisenberg BH surrounded by perfect fluid dark matter. The geometry contains a compact non-linear electrodynamic corr…
Correspondence between a decaying dark matter sector scenario and scalar field model
Gilberto Aguilar-Pérez, Deryan Alvarado, Miguel Cruz +2
We explore the theoretical viability of modeling a decaying dark matter sector through a unified scalar field approach. Using exact analytical solutions of the Friedmann constraint…
Breaking Parameter Degeneracies in a Magnetically Charged Black Hole Embedded in a Hernquist Dark-Matter Halo: A Multi-Observable Analysis
Ali Ovgun, Reggie C. Pantig, Joel Saavedra
We study the degeneracy of intrinsic and environmental parameters for BH observables in a static spacetime sourced by a nonlinear magnetic monopole immersed in a Hernquist dark-mat…
Thermodynamic behavior of cosmological models with fractional entropy
Miguel Cruz, Diego da Silva, Simón González +3
We investigate the thermodynamic and phenomenological implications of a cosmological model governed by fractional entropy applied to the apparent horizon of a flat Friedmann-Lemaît…
Non-minimally coupled loop quantum inflation with inverse-volume corrections
Rudranil Roy, Giovanni Otalora, Joel Saavedra +1
We study slow-roll inflation driven by a scalar field non-minimally coupled to gravity within the effective framework of Loop Quantum Cosmology (LQC), including inverse-volume corr…