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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
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…