3 papers
gr-qc2026
Phase-resolved field-space distance criteria in ekpyrotic, bouncing and cyclic cosmologies
Marcin Postolak
The inflationary Lyth bound relates the primordial tensor amplitude to the inflaton field excursion. In ekpyrotic, bouncing and cyclic cosmologies there is no analogous universal t…
gr-qc2026
Non-minimally coupled scalar field dark sector of the universe: in-depth (Einstein frame) case study
Marcin Postolak
In this study, motivated by recent results from DESI DR2 indicating a possible preference for evolving dark energy in some combined data analyses, we analyze spatially flat FLRW in…
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.…