Zobrazeno 1 - 10
of 291
pro vyhledávání: '"Andronikos Paliathanasis"'
Autor:
Andronikos Paliathanasis
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 4, Pp 1-10 (2024)
Abstract Inspired by the generalization of scalar field gravitational models with a minimum length we study the equivalent theory in modified theories of gravity. The quadratic generalized uncertainty principle (GUP) gives rise to a deformed Heisenbe
Externí odkaz:
https://doaj.org/article/80b190c416044f63a099224cd2ba56fb
The Brans–Dicke field in non-metricity gravity: cosmological solutions and conformal transformations
Autor:
Andronikos Paliathanasis
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 2, Pp 1-12 (2024)
Abstract We consider the Brans–Dicke theory in non-metricity gravity, which belongs to the family of symmetric teleparallel scalar–tensor theories. Our focus lies in exploring the implications of the conformal transformation, as we derive the con
Externí odkaz:
https://doaj.org/article/10cd1376aecc4fe88c5f4836998c2126
Autor:
Andronikos Paliathanasis
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 8, Pp 1-13 (2023)
Abstract For a spatially Friedmann–Lemaître–Robertson–Walker cosmology, we propose a multi-scalar field gravitational model. Specifically, we consider a two-scalar field cosmological model in which the kinetic components of the scalar fields e
Externí odkaz:
https://doaj.org/article/a06546d5153f473aa269548d13e4d988
Autor:
Andronikos Paliathanasis
Publikováno v:
Axioms, Vol 13, Iss 5, p 331 (2024)
The linearization of nonlinear differential equations represents a robust approach to solution derivation, typically achieved through Lie symmetry analysis. This study adopts a geometric methodology grounded in the Eisenhart lift, revealing transform
Externí odkaz:
https://doaj.org/article/351944a41e5c4f869913874498ecf16f
Publikováno v:
Fractal and Fractional, Vol 8, Iss 5, p 253 (2024)
Fractional differential calculus is a mathematical tool that has found applications in the study of social and physical behaviors considered “anomalous”. It is often used when traditional integer derivatives models fail to represent cases where t
Externí odkaz:
https://doaj.org/article/874cc7c0b0d64701badd320aaaf4b3b1
Autor:
Andronikos Paliathanasis
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 3, Pp 1-14 (2023)
Abstract In the context of scalar-torsion theory we investigate the evolution of the cosmological anisotropies for a Kantowski–Sachs background geometry. We study the phase-space of the gravitational field equations by determining the admitted stat
Externí odkaz:
https://doaj.org/article/41ba0afc40304afd95c51fe8c5ec0b21
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 11, Pp 1-11 (2022)
Abstract We obtain solutions of the time-dependent Einstein Field Equations which satisfy the Karmarkar condition via the method of Lie symmetries. Spherically symmetric spacetime metrics are used with metric functions set to impose conformal flatnes
Externí odkaz:
https://doaj.org/article/6c078e91f1584de58e34840b3a08fc6e
Autor:
Rangasamy Sinuvasan, Amlan K. Halder, Rajeswari Seshadri, Andronikos Paliathanasis, Peter G. L. Leach
Publikováno v:
Symmetry, Vol 15, Iss 10, p 1908 (2023)
The magnetohydrodynamics (1 + 1) dimension equation, with a force and force-free term, is analysed with respect to its point symmetries. Interestingly, it reduces to an Abel’s Equation of the second kind and, under certain conditions, to equations
Externí odkaz:
https://doaj.org/article/74deca4139084aa1be570a921846a810
Autor:
Andronikos Paliathanasis
Publikováno v:
Universe, Vol 9, Iss 9, p 406 (2023)
We analyze the phase-space of an alternate scalar field cosmology that aims to combine the concepts of dark energy and the dark sector. The investigation focuses on stationary points within this phase-space, considering different functional forms of
Externí odkaz:
https://doaj.org/article/1ce597a4c4d34e4880d12260f5d2e509
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 3, Pp 1-9 (2022)
Abstract In this work, we have extended the analysis on the generalized Chaplygin gas (GCG) model as the unification of dark energy and dark matter. Specifically, we have shown that the model of our consideration known as the new generalized Chaplygi
Externí odkaz:
https://doaj.org/article/8ad3e0d7da124e6eb33b920f620a71e1