5 papers
Generalizing the CPL Parametrization through Dark Sector Interaction
Mikel Artola, Ruth Lazkoz, Vincenzo Salzano
We investigate a hierarchy of interacting dark energy (IDE) models featuring a non-gravitational coupling between dark matter and dark energy. Specifically, we examine scenarios wh…
Is Chevallier-Polarski-Linder dark energy a mirage?
Mikel Artola, Ismael Ayuso, Ruth Lazkoz +1
Recent observations from the Dark Energy Spectroscopic Instrument (DESI) raise doubts about the standard cosmological model, CDM, suggesting a preference for an inherently dyna…
A Spectrum of Cosmological Rips and Their Observational Signatures
Mikel Artola, Ruth Lazkoz, Vincenzo Salzano
We present a unified dark energy framework capable of generating a continuous spectrum of cosmological ``rip'' scenarios -- including the Big Rip, Grand Rip, Mild Rip, Little Rip,…
Geometric acceleration in theories
Mikel Artola, Ismael Ayuso, Ruth Lazkoz +2
The framework of gravity enables the depiction of an effective dark energy fluid that emerges from geometry itself, thus leading to modifications in the cosmological pheno…
Gravitational and electromagnetic Cherenkov radiation constraints in modified dispersion relations
Mikel Artola, José A. R. Cembranos, Prado MartÃn-Moruno
Motivated by different approaches to quantum gravity, one could consider that Lorentz invariance is not an exact symmetry of nature at all energy scales. Following this spirit, mod…