84 citations · 656 across the 80 of their papers we have counts for
4 papers · 2 filters
Structure of infinity in cosmology
Spiros Cotsakis
We discuss recent developments related to certain blow up methods suitable for the analysis of cosmological singularities and asymptotics. We review results obtained in a variety o…
The regular state in higher-order gravity
Spiros Cotsakis, Seifedine Kadry, Dimitrios Trachilis
We consider the higher-order gravity theory derived from the quadratic lagrangian in vacuum as a first-order (ADM-type) system with constraints, and build time development…
The initial state of generalized radiation universes
Spiros Cotsakis, Giorgos Kolionis, Antonios Tsokaros
We use asymptotic methods to study the early time stability of isotropic and homogeneous solutions filled with radiation which are close initially to the exact, flat, radiation sol…
Singularities in cosmologies with interacting fluids
Spiros Cotsakis, Georgia Kittou
We study the dynamics near finite-time singularities of flat isotropic universes filled with two interacting but otherwise arbitrary perfect fluids. The overall dynamical picture r…