The generic sudden singularity in Brans–Dicke theory
JD Barrow, S Cotsakis, D Trachilis - The European Physical Journal C, 2020 - Springer
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 11 …
equations with a fluid source near a sudden singularity. This solution contains 11 …
Infinity in string cosmology: A review through open problems
I Antoniadis, S Cotsakis - International Journal of Modern Physics D, 2017 - World Scientific
We review recent developments in the field of string cosmology with particular emphasis on
open problems having to do mainly with geometric asymptotics and singularities. We …
open problems having to do mainly with geometric asymptotics and singularities. We …
Sudden shock waves in modified gravity
I Antoniadis, S Cotsakis, D Trachilis - The European Physical Journal C, 2023 - Springer
We construct a generic asymptotic solution for modified gravity near a sudden singularity.
This solution contains a fluid source with no equation of state and is function-counting …
This solution contains a fluid source with no equation of state and is function-counting …
Structure of infinity in cosmology
S Cotsakis - International Journal of Modern Physics D, 2013 - World Scientific
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 …
analysis of cosmological singularities and asymptotics. We review results obtained in a …
New cosmological solutions in hybrid metric-Palatini gravity from dynamical symmetries
A Paliathanasis - Modern Physics Letters A, 2021 - World Scientific
We investigate the existence of Liouville integrable cosmological models in hybrid metric-
Palatini theory. Specifically, we use the symmetry conditions for the existence of quadratic in …
Palatini theory. Specifically, we use the symmetry conditions for the existence of quadratic in …
Quasi-isotropic expansion for a two-fluid cosmological model containing radiation and string gas
IM Khalatnikov, AY Kamenshchik… - Journal of Experimental …, 2019 - Springer
The quasi-isotropic expansion for a simple two-fluid cosmological model consisting of
radiation and string gas is constructed. Expressions for the first-order gradient-dependent …
radiation and string gas is constructed. Expressions for the first-order gradient-dependent …
The radiation instability in modified gravity
S Cotsakis, D Trachilis - International Journal of Modern Physics A, 2021 - World Scientific
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 …
Lagrangian theories of gravity written as a system of evolution equations with constraints …
Generic regular universes in higher order gravity theories
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 …
derivatives in vacuum. We prove genericity of regularity of solutions under the assumption of …
[HTML][HTML] Tunneling through bridges: Bohmian non-locality from higher-derivative gravity
GS Duane - Physics Letters A, 2019 - Elsevier
A classical origin for the Bohmian quantum potential, as that potential term arises in the
quantum mechanical treatment of black holes and Einstein–Rosen (ER) bridges, can be …
quantum mechanical treatment of black holes and Einstein–Rosen (ER) bridges, can be …
Quantum Nonlocality from Higher-Derivative Gravity
GS Duane - 2018 - preprints.org
A classical origin for the Bohmian quantum potential, as that potential term arises in the
quantum mechanical treatment of black holes and Einstein-Rosen (ER) bridges, can be …
quantum mechanical treatment of black holes and Einstein-Rosen (ER) bridges, can be …