6 papers
Observational constraints on Diffusion Cosmologies in Unimodular Gravity from DESI DR2
Gabriel Gomez, Guillermo Palma, Norman Cruz
Diffusion functions in unimodular gravity induce a dynamical effective cosmological constant, providing an appealing framework in light of recent DESI observations. In this work, w…
Unimodular Gravity with Arbitrary Diffusion Function: A Dynamical System Reconstruction Approach
Gabriel Gómez, Guillermo Palma, Norman Cruz
We investigate cosmological diffusion models in unimodular gravity within a dynamical systems reconstruction framework. By treating the logarithmic slope of the diffusion sector as…
Strong-lensing degeneracies of black holes embedded in self-interacting scalar field dark matter halos
Mohsen Fathi, Gabriel Gómez
In this paper, we explore the strong gravitational lensing properties of black holes embedded in self-interacting scalar field dark matter halos, together with NFW-type configurati…
Perturbative Effects of Dark Matter Environments on Black Hole Shadows
Gabriel Gomez
Constructing spacetime solutions that describe black holes embedded in dark matter environments is a crucial step toward probing the properties of dark matter in the strong-field r…
Non-linear causal bulk viscosity in Unified Dark Matter Cosmologies
Guillermo Palma, Gabriel Gomez
We propose a bulk viscous unified dark matter scenario based on a nonlinear extension of the full causal Israel-Stewart theory. This framework allows the viscous fluid to remain fa…
Viscous Unified Dark Matter Models Under Scrutiny: Uncovering Inconsistencies from Dynamical System Analysis
Guillermo Palma, Gabriel Gomez, Norman Cruz
Viscous unified dark matter models aim to describe the dark sector of the Universe, as the dark matter fluid itself gives rise to an accelerated expansion due to a negative bulk vi…