3 papers
astro-ph.CO2026
The Sign-Switching of the Cosmological Constant
Mariam Bouhmadi-López, Beñat Ibarra-Uriondo
We propose and investigate a class of dynamical dark energy models in which the cosmological constant evolves from negative values in the early Universe to a positive value at low…
gr-qc2025
Cosmological perturbations for smooth sign-switching dark energy models
Mariam Bouhmadi-López, Beñat Ibarra-Uriondo
In this work, we carry out a comprehensive perturbative analysis of four cosmological models featuring a sign-switching cosmological constant. Among these, we include the well-know…
gr-qc2025
Cosmographic analysis of sign-switching dark energy
Mariam Bouhmadi-López, Beñat Ibarra-Uriondo
Inspired by the well-studied CDM model, we propose and investigate a class of dynamical dark energy models that evolve from a negative cosmological constant, transitioni…