84 citations · 656 across the 80 of their papers we have counts for
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gr-qc2020
The radiation instability in modified gravity
Spiros Cotsakis, Dimitrios Trachilis
We study the problem of the instability of inhomogeneous radiation universes in quadratic lagrangian theories of gravity written as a system of evolution equations with constraints…
gr-qc2020★ 2 cited
Onset of synchronization in coupled Mixmaster oscillators
Spiros Cotsakis
We consider the problem of asymptotic synchronization of different spatial points coupled to each other in inhomogeneous spacetime and undergoing chaotic Mixmaster oscillations tow…
gr-qc2020★ 6 cited
The Generic Sudden Singularity in Brans-Dicke Theory
John D. Barrow, Spiros Cotsakis, Dimitrios Trachilis
We construct a formal asymptotic series expansion for a general solution of the Brans-Dicke equations with a fluid source near a sudden singularity. This solution contains eleven i…