4 papers
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…
Modified Teleparallel Gravity, DESI BAO and the Tension
Mariam Bouhmadi-López, Carlos G. Boiza, Maria Petronikolou +1
We investigate whether late-time modifications of gravity in the teleparallel framework can impact the current tension in the Hubble constant , focusing on cosmology as…
Dark energy driven by an oscillating generalised axion-like quintessence field
Mariam Bouhmadi-López, Carlos G. Boiza
Generalised axion-like scalar fields provide a well-motivated framework for describing the late-time acceleration of the Universe. As the field evolves, it rolls down its potential…
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…