33 citations · 127 across the 14 of their papers we have counts for
4 papers · 1 filter
Generic regular universes in higher order gravity theories
Spiros Cotsakis, Dimitrios Trachilis, Antonios Tsokaros
We review recent results on the Cauchy-Kowalevsky structure of theories with higher derivatives in vacuum. We prove genericity of regularity of solutions under the assumption of an…
Asymptotic states of generalized universes with higher derivatives
Spiros Cotsakis, Georgios Kolionis, Antonios Tsokaros
We review ongoing research related to the asymptotic dynamics of isotropic universes in theories with higher derivatives, especially near the initial singularity. We treat two majo…
Limits of isotropic universes with interacting fluids
Spiros Cotsakis, Georgia Kittou
We find various asymptotic limits of universes containing two interacting fluids which interact and exchange energy. We study the finite-time singularities that may develop in thes…
Series expansions and sudden singularities
John D. Barrow, S. Cotsakis, A. Tsokaros
We construct solutions of the Friedmann equations near a sudden singularity using generalized series expansions for the scale factor, the density, and the pressure of the fluid con…