10 papers
Curvature-induced phantom behavior and cosmological bounces without violating the Dominant Energy Condition
Miguel Cruz, Samuel Lepe
We show that a spatially closed universe can exhibit effective phantom dynamics () and reach a finite-time cosmological event without violating the Dominant Energy Condition…
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, VÃctor 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) backgrou…
Thermodynamic constraints and future singularities in Unimodular Gravity driven by phantom and non-phantom fluids
Norman Cruz, Samuel Lepe, Guillermo Palma +1
This work investigates future cosmological singularities in a flat FLRW universe filled with a single barotropic fluid, (), within the framework of unimodular gravit…
Beyond Comoving Volume: Horizon Flux and Matter Creation in Modified Cosmology from the Unified First Law of Thermodynamics
VÃctor H. Cárdenas, Miguel Cruz, Samuel Lepe
We explore the derivation of the Friedmann equations from a thermodynamic perspective, applying the unified first law of thermodynamics to the apparent horizon of a flat Friedmann-…
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…