Zobrazeno 1 - 10
of 1 682
pro vyhledávání: '"Paliathanasis, A."'
Autor:
Paliathanasis, Andronikos
Publikováno v:
Eur. Phys. J. C 84, 1080 (2024)
The connection between the Equivalence Principle and Noether's theorem was discussed in S. Capozziello and C. Ferrara, Int. J. Geom. Meth. Mod. Phys. 21, 2440014 (2024). However, it is known that the Noether symmetry condition is independent of the e
Externí odkaz:
http://arxiv.org/abs/2410.14568
We solve the gravitational field equations for a static, spherically symmetric spacetime within the framework of the symmetric teleparallel theory of gravity. Specifically, we derive new solutions within the context of power-law $f(Q)$ gravity and th
Externí odkaz:
http://arxiv.org/abs/2410.04513
Autor:
Paliathanasis, Andronikos
Within the framework of symmetric teleparallel $f\left( Q\right) $-gravity for a connection defined in the non-coincidence gauge we derive the Wheeler-DeWitt equation of quantum cosmology. Because the gravitational field equation in $f\left( Q\right)
Externí odkaz:
http://arxiv.org/abs/2409.07755
We revise the cosmological interaction between dark energy and dark matter. More precisely, we focus on models that support compartmentalization or co-existence in the dark sector of the universe. Within the framework of a homogeneous and isotropic,
Externí odkaz:
http://arxiv.org/abs/2409.05348
Autor:
Paliathanasis, Andronikos
This study investigates the geometric linearization of constraint Hamiltonian systems using the Jacobi metric and the Eisenhart lift. We establish a connection between linearization and maximally symmetric spacetimes, focusing on the Noether symmetri
Externí odkaz:
http://arxiv.org/abs/2408.01020
Autor:
Paliathanasis, Andronikos
Symmetric teleparallel $f(Q)$-gravity allows for the presence of a perfect fluid with a tilted velocity in the Kantowski-Sachs geometry. In this dipole model, we consider an ideal gas and we investigate the evolution of the physical parameters. The t
Externí odkaz:
http://arxiv.org/abs/2407.15069
Autor:
Paliathanasis, Andronikos
We investigate the dynamics and the phase-space evolution for the scalar nonmetricity cosmology with a Chameleon mechanism. In particular, we consider a spatially flat Friedmann--Lema\^{\i}tre--Robertson--Walker geometry and within the framework of s
Externí odkaz:
http://arxiv.org/abs/2407.05042
Autor:
Paliathanasis, Andronikos, Leon, Genly
The Kasner spacetimes are exact solutions that are self-similar and of significant interest because they can describe the dynamic evolution of kinematic variables near the singularity of the Mixmaster universe. The chaotic behavior of the Mixmaster u
Externí odkaz:
http://arxiv.org/abs/2406.04563
Autor:
Paliathanasis, Andronikos
We review the solution space for the field equations of Einstein's General Relativity for various static, spherically symmetric spacetimes. We consider the vacuum case, represented by the Schwarzschild black hole; the de Sitter-Schwarzschild geometry
Externí odkaz:
http://arxiv.org/abs/2406.01998
Autor:
Paliathanasis, Andronikos
We explore the introduction of the cosmological constant via equivalent transformations in cosmology. We consider the Wheeler-DeWitt equation for the CDM universe and we construct the Hamilton-Jacobi action for the $\Lambda$CDM model. We discuss how
Externí odkaz:
http://arxiv.org/abs/2405.20683