540 citations · 6.4k across the 303 of their papers we have counts for
14 papers · 2 filters
(Compactified) black branes in four dimensional f(R)-gravity
N. Dimakis, Alex Giacomini, Andronikos Paliathanasis
A new family of analytical solutions in a four dimensional static spacetime is presented for -gravity. In contrast to General Relativity, we find that a non triv…
Duality transformation and conformal equivalent scalar-tensor theories
Gabriele Gionti, S. J., Andronikos Paliathanasis
We deal with the duality symmetry of the Dilaton field in cosmology and specifically with the so-called Gasperini-Veneziano duality transformation. In particular, we determine two…
Dust fluid component from Lie symmetries in Scalar field Cosmology
Andronikos Paliathanasis
We show that in scalar-field cosmology, a dust fluid follows as quantum corrections from solutions of the Wheeler-DeWitt equation generated by Lie symmetries. The energy density of…
Finsler-Randers Cosmology: dynamical analysis and growth of matter perturbations
G. Papagiannopoulos, S. Basilakos, A. Paliathanasis +2
We study for the first time the dynamical properties and the growth index of linear matter perturbations of the Finsler-Randers (FR) cosmological model, for which we consider that…
Stability of the Kasner Universe in f(T) Gravity
Andronikos Paliathanasis, Jackson Levi Said, John D. Barrow
gravity offers an alternative context in which to consider gravitational interactions where torsion, rather than curvature, is the mechanism by which gravitation is communic…
Cartan symmetries and global dynamical systems analysis in a higher-order modified teleparallel theory
L. Karpathopoulos, S. Basilakos, G. Leon +2
In a higher-order modified teleparallel theory cosmological we present analytical cosmological solutions. In particular we determine forms of the unknown potential which drives the…
Latest astronomical constraints on some nonlinear parametric dark energy models
Weiqiang Yang, Supriya Pan, Andronikos Paliathanasis
We consider nonlinear redshift-dependent equation of state parameters as dark energy models in a spatially flat Friedmann-Lemaître-Robertson-Walker universe. To depict the expansio…
Analytic Solution of the Starobinsky Model for Inflation
Andronikos Paliathanasis
We prove that the field equations of the Starobinsky model for inflation in a Friedmann-Lema\^ıtre-Robertson-Walker constitute an integrable system as the field equations pass the…
de Sitter and Scaling solutions in a higher-order modified teleparallel theory
Andronikos Paliathanasis
The existence and the stability conditions for some exact relativistic solutions of special interest are studied in a higher-order modified teleparallel gravitational theory. The t…
Noether symmetries and stability of ideal gas solution in Galileon Cosmology
N. Dimakis, Alex Giacomini, Sameerah Jamal +2
A class of generalized Galileon cosmological models, which can be described by a point-like Lagrangian, is considered in order to utilize Noether's Theorem to determine conservatio…
Dynamical Analysis of an Integrable Cubic Galileon Cosmological Model
Alex Giacomini, Sameerah Jamal, Genly Leon +2
Recently a cubic Galileon cosmological model was derived by the assumption that the field equations are invariant under the action of point transformations. The cubic Galileon mode…
Symmetries and Singularities of the Szekeres System
Andronikos Paliathanasis, P. G. L. Leach
The Szekeres system is studied with two methods for the determination of conservation laws. Specifically we apply the theory of group invariant transformations and the method of si…
Integrability from Point Symmetries in a family of Cosmological Horndeski Lagrangians
N. Dimakis, Alex Giacomini, Andronikos Paliathanasis
For a family of Horndeski theories, formulated in terms of a generalized Galileon model, we study the integrability of the field equations in a Friedmann-Lema\^ıtre-Robertson-Walke…
Cosmological Evolution and Exact Solutions in a Fourth-order Theory of Gravity
Andronikos Paliathanasis
A fourth-order theory of gravity is considered which in terms of dynamics has the same degrees of freedom and number of constraints as those of scalar-tensor theories. In addition…