22 citations · 53 across the 5 of their papers we have counts for
6 papers
Non-linear interactions in cosmologies with energy exchange
John D. Barrow, Georgia Kittou
We investigate the case of two interacting fluids in homogeneous and isotropic cosmologies with a non-linear interaction term. The interaction term avoids the unrealistic form gene…
Interacting vacuum at infinity
Georgia Kittou
We apply the central extension technique of Poincare to dynamics involving an interacting mixture of pressureless matter and vacuum near a finite-time singularity. We show that the…
Is interacting vacuum viable?
Georgia Kittou
We study the asymptotic dynamics of dark energy as a mixture of pressureless matter and an interacting vacuum component. We find that the only dynamics compatible with current obse…
Flat limits of curved interacting cosmic fluids
Spiros Cotsakis, Georgia Kittou
We study curved isotropic cosmologies filled with two interacting fluids near their time singularities. We find that a number of these universes asymptote to flat limits in the sen…
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…
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…