540 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- A. Paliathanasis2 profiles185 · h 42
- G. Leon2 profiles55 · h 31
- M. Govender2 profiles30 · h 21
- M. Znojil2 profiles27 · h 34
- K. G. Zloshchastiev26 · h 18
- P. Leach4 profiles22 · h 15
- S. Pan22 · h 46
- Supriya Pan3 profiles21 · h 14
- Weiqiang Yang2 profiles21 · h 42
- N. Dimakis2 profiles19 · h 21
- A. Giacomini2 profiles13 · h 19
- E. di Valentino10 · h 2
- Austral University of ChileCL111 papers
- Universidad Católica del NorteCL85 papers
- Presidency UniversityIN34 papers
- University of KwaZulu-NatalZA34 papers
- National and Kapodistrian University of AthensGR26 papers
- University of Hradec KrálovéCZ25 papers
- Czech Academy of Sciences, Nuclear Physics InstituteCZ24 papers
- Liaoning Normal UniversityCN22 papers
- National Institute for Theoretical PhysicsZA22 papers
- University of SheffieldGB16 papers
- National Observatory of AthensGR14 papers
- North-West UniversityZA14 papers
29 papers · 1 filter
(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…
Approximate Noether Symmetries and Collineations for Regular Perturbative Lagrangians
Andronikos Paliathanasis, Sameerah Jamal
Regular perturbative Lagrangians that admit approximate Noether symmetries and approximate conservation laws are studied. Specifically, we investigate the connection between approx…
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…
Relativistic compact stars with charged anisotropic matter
S. K. Maurya, Ayan Banerjee, Phongpichit Channuie
In this article we perform a detailed theoretical analysis for a class of new exact solutions with anisotropic fluid distribution of matter for compact objects in hydrostatic equil…
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…
Lie symmetries for systems of evolution equations
Andronikos Paliathanasis, Michael Tsamparlis
The Lie symmetries for a class of systems of evolution equations are studied. The evolution equations are defined in a bimetric space with two Riemannian metrics corresponding to t…
Expanding, shearing and accelerating isotropic plane symmetric universe with conformal Kasner geometry
Sudan Hansraj, Megandhren Govender, Narenee Mewalal
We construct a model of a universe filled with a perfect fluid with isotropic particle pressure. The anisotropic plane symmetric Kasner spacetime is used as a seed metric and throu…
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…
Radiating fluid sphere immersed in an anisotropic atmosphere
NF Naidu, M Govender, S Thirukkanesh +1
We model a radiating star undergoing dissipative gravitational collapse in the form of radial heat flux. The exterior of the collapsing star is described by the generalised Vaidya…
Charged compact star model in Einstein-Maxwell-Gauss-Bonnet gravity
Piyali Bhar, Megan Govender
Present paper provides a model of static charged anisotropic fluid sphere in the EinsteinMaxwell- GaussBonnet (EMGB) theory of gravitation. We select KB anstz as the metric co-effi…
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…
Integrability and chemical potential in the (3+1)-dimensional Skyrme model
P. D. Alvarez, F. Canfora, N. Dimakis +1
Using a remarkable mapping from the original (3+1)dimensional Skyrme model to the Sine-Gordon model, we construct the first analytic examples of Skyrmions as well as of Skyrmions--…
Lie and Noether point Symmetries for a Class of Nonautonomous Dynamical Systems
Leonidas Karpathopoulos, Andronikos Paliathanasis, Michael Tsamparlis
We prove two general theorems which determine the Lie and the Noether point symmetries for the equations of motion of a dynamical system which moves in a general Riemannian space u…
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…
Integrability of the Einstein-nonlinear -model in a nontrivial topological sector
Andronikos Paliathanasis, Tim Taves, P. G. L. Leach
The integrability of the\ Einstein-nonlinear -model with nonvanishing cosmological charge is studied. We apply the method of singularity analysis of differential equ…
Topologically non-trivial configurations in the 4d Einstein--nonlinear -model system
Fabrizio Canfora, Nikolaos Dimakis, Andronikos Paliathanasis
We construct exact, regular and topologically non-trivial\ configurations of the coupled Einstein-nonlinear sigma model in (3+1) dimensions. The ansatz for the nonlinear fi…
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…
A family of charged compact objects with anisotropic pressure
S. K. Maurya, M. Govender
Utilizing an ansatz developed by Maurya and co-workers we present a class of exact solutions of the Einstein-Maxwell field equations describing a spherically symmetric compact obje…
Generating physically realizable stellar structures via embedding
S. K. Maurya, M. Govender
In this work we present an exact solution of the Einstein-Maxwell field equations describing compact, charged objects within the framework of classical general relativity. Our mode…
Cosmological Einstein-Skyrme solutions with non-vanishing topological charge
Fabrizio Canfora, Andronikos Paliathanasis, Tim Taves +1
Time-dependent analytic solutions of the Einstein-Skyrme system --gravitating Skyrmions--, with topological charge one are analyzed in detail. In particular, the question of whethe…
Group invariant transformations for the Klein-Gordon equation in three dimensional flat spaces
Sameerah Jamal, Andronikos Paliathanasis
We perform the complete symmetry classification of the Klein-Gordon equation in maximal symmetric spacetimes. The central idea is to find all possible potential functions $V(t,x,y)…
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…