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gr-qc2026
The alternative scalar field dark sector of the Universe: Cosmological inflation, quintessence and ekpyrotic model in the framework of scalar-tensor cosmology
Marcin Postolak
This dissertation investigates scalar field descriptions of the dark sector (of the Universe), with emphasis on scalar-tensor cosmology, inflationary effective field theory, quinte…
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…