8 papers
Do we really need alternatives to the CDM parameterization after the DESI DR2?
Youri Carloni, Orlando Luongo, Marek Biesiada
We introduce a density-level pivot construction for the Chevallier-Polarski-Linder (CPL) parameterization by defining the normalized dark energy density …
Alleviating the Hubble tension with the CDM model
Youri Carloni
We formulate a novel extension of the CDM model, named CDM, in which we consider an additional term at early times in order to alleviate the Hubble tension. This add…
A barotropic alternative to Early Dark Energy for alleviating the tension
Youri Carloni, Orlando Luongo
We propose a cosmological scenario in which, beyond matter and radiation, an additional barotropic fluid with positive equation of state contributes to the cosmic energy bud…
Challenging the CDM parametrization through rational expansions in view of DESI data release
Youri Carloni, Orlando Luongo, Marek Biesiada
In view of the new Dark Energy Spectroscopic Instrument (DESI) 2025 results, we analyze three types of \emph{Padé cosmology}, based on rational series making use of Padé approxim…
Parameterizing quasi-quintessence and quasi-phantom fields without the nearly flat potential approximation
Anna Chiara Alfano, Youri Carloni
An alternative dark energy description based on a generalized K-essence scenario is here explored. In particular, we consider a \emph{quasi-quintessence} and/or \emph{quasi-phantom…
Addressing the tension through matter with pressure and no early dark energy
Youri Carloni, Orlando Luongo, Marco Muccino
We propose that the Hubble tension arises due to an unaccounted additional component, that behaves as \emph{matter with pressure}. We demonstrate that this fluid remains subdominan…