3 papers
gr-qc2026
Spatial curvature in Unimodular Gravity
Gilberto Aguilar-Pérez, Miguel Cruz, Samuel Lepe
We investigate the cosmological implications of unimodular gravity (UG) featuring energy diffusion and spatial curvature. While standard diffusion models often suffer from thermody…
gr-qc2025
Cosmological evolution driven by polytropic fluids in an inhomogeneous spacetime
Gilberto Aguilar-Pérez, Miguel Cruz, Mohsen Fathi +2
Addressing the late-time accelerated expansion of the universe, known as the "dark energy problem", remains a central challenge in cosmology. While the cosmological constant is the…
gr-qc2024
Exploring the cosmological degeneracy between decaying dark matter model and viscous CDM
Gilberto Aguilar-Pérez, Ana A. Avilez-López, Miguel Cruz
In the context of a homogeneous and isotropic universe, we consider the degeneracy condition at the background level between two scenarios in which processes out of equilibrium are…