3 papers
astro-ph.CO2025
The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
Eleonora Di Valentino, Jackson Levi Said, Adam Riess +533
The standard model of cosmology has provided a good phenomenological description of a wide range of observations both at astrophysical and cosmological scales for several decades.…
gr-qc2025
Avoiding Big Rip Singularities in Phantom Scalar Field theory with Gauss-Bonnet term
Giannis Papagiannopoulos, Genly Leon, Andronikos Paliathanasis
We consider a phantom scalar field coupled to the Gauss-Bonnet scalar within a spatially flat FLRW geometry. Moreover, we assume a nonzero interaction between the scalar field and…
gr-qc2025
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…