5 papers
Alleviating the Hubble Tension with Smooth Sign-Switching Dark Energy: Full CMB Constraints with DESI and PantheonPlus
Mariam Bouhmadi-López, Hsu-Wen Chiang, Beñat Ibarra-Uriondo
Sign-switching dark energy has recently been proposed as a minimal modification of the late-time expansion history aimed at alleviating tensions within the standard cosmological mo…
Sign-Switching Dark Energy: Smooth Transitions with Recent DESI DR2 Observations
Beñat Ibarra-Uriondo, Mariam Bouhmadi-López
Sign-switching dark energy provides a novel mechanism for modifying the late-time expansion history of the Universe without invoking additional fields or finely tuned initial condi…
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…
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…
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, transition…