3 papers
gr-qc2026
Asymptotic Theorems and Averaging in Scalar Field Cosmology
Genly Leon, Aleksander Kozak, Claudio Michea
We present a hybrid study that combines a concise review of scalar-field cosmology with new analytic developments that integrate averaging reductions for oscillatory regimes with d…
gr-qc2026
Disformal transformations in a Palatini extension of Horndeski's gravity
Aleksander Kozak
In this paper, we extend Horndeski's theory into the Palatini approach, assuming that the metric tensor and the (symmetric) connection are a priori independent objects. We introduc…
gr-qc2025
Slow-Fast Evolution of Scalar Fields in Higher-Order Cosmological Gravity: Dynamics Inspired by the Pais--Uhlenbeck Oscillator
Manuel Gonzalez-Espinoza, Genly Leon, Yoelsy Leyva +3
We investigate the cosmological dynamics of scalar fields governed by higher-order gravity, with particular emphasis on models inspired by the Pais-Uhlenbeck oscillator--a prototyp…