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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-qc2025
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…
gr-qc2023
Is it possible to separate baryonic from dark matter within the -CDM formalism?
Andrzej Borowiec, Marcin Postolak
We found general solutions of matter stress-energy (non-)conservation in scalar-tensor FLRW-type cosmological models by extending the logotropic formalism to the case of non-minima…