5 papers
Constraints on Chiral-Quintom dark energy after DESI DR2 and impact on unifying dark energy with inflation
Andronikos Paliathanasis, Tommaso Mengoni, Genly Leon +1
The recent data release DR2 from the Dark Energy Spectroscopic Instrument (DESI) has reinforced compelling evidence supporting the dynamical nature of dark energy. In this respect,…
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 approximan…
Gravitational waves from two scalar fields unifying the dark sector with inflation
Orlando Luongo, Tommaso Mengoni, Paulo M. Sá
We investigate the gravitational-wave background predicted by a two-scalar-field cosmological model that aims to unify primordial inflation with the dark sector, namely late-time d…
Cosmological phase-space analysis of -theories of gravity
Giannis Papagiannopoulos, Orlando Luongo, Genly Leon +1
The impact of topological terms that modify the Hilbert-Einstein action is here explored by virtue of a further contribution. In particular, we investigate the phase-space s…
Stability analysis of dilaton-inspired scalar field within the geometrical trinity of gravity
Youri Carloni, Orlando Luongo, Andronikos Paliathanasis
We investigate the dynamics of the dilaton-inspired scalar field, formally rewritten by means of a Brans-Dicke Lagrangian, within the framework of \emph{geometrical trinity of grav…