Zobrazeno 1 - 10
of 62
pro vyhledávání: '"Grammenos, Th."'
Publikováno v:
Universe, 6(5) (2020) 69
The space-time geometry exterior to a new four-dimensional, spherically symmetric and charged black hole solution that, through a coupling of general relativity with a non-linear electrodynamics, is everywhere non-singular, for small $r$ it behaves a
Externí odkaz:
http://arxiv.org/abs/2002.06573
The energy-momentum localization for a new four-dimensional and spherically symmetric, charged black hole solution that through a coupling of general relativity with non-linear electrodynamics is everywhere non-singular while it satisfies the weak en
Externí odkaz:
http://arxiv.org/abs/1906.01977
Autor:
Radinschi, I., Grammenos, Th., Rahaman, Farook, Spanou, A., Islam, Sayeedul, Chattopadhyay, Surajit, Pasqua, Antonio
The energy-momentum of a new four-dimensional, charged, spherically symmetric and nonsingular black hole solution constructed in the context of general relativity coupled to a theory of nonlinear electrodynamics is investigated, whereby the nonlinear
Externí odkaz:
http://arxiv.org/abs/1707.00329
A study about the energy and momentum distributions of a new charged regular black hole solution with a nonlinear electrodynamics source is presented. The energy and momentum are calculated using the Einstein and M{\o}ller energy-momentum complexes.
Externí odkaz:
http://arxiv.org/abs/1607.03505
Publikováno v:
Adv.Math.Phys., Volume 2015 (2015), 530281
In this work a study about the energy-momentum of a new four-dimensional spherically symmetric, static and charged, regular black hole solution developed in the context of general relativity coupled to nonlinear electrodynamics is presented. Asymptot
Externí odkaz:
http://arxiv.org/abs/1404.6410
Autor:
Christodoulakis, T., Dimakis, N., Terzis, Petros A., Vakili, Babak, Melas, E., Grammenos, Th.
We use the conditional symmetry approach to study the $r$-evolution of a minisuperspace spherically symmetric model both at the classical and quantum level. After integration of the coordinates $t$, $\theta$ and $\phi$ in the gravitational plus elect
Externí odkaz:
http://arxiv.org/abs/1309.6106
Autor:
Christodoulakis, T., Dimakis, N., Terzis, Petros A., Doulis, G., Grammenos, Th., Melas, E., Spanou, A.
Publikováno v:
Journal of Geometry and Physics, 71 (2013) 127-138
A conditional symmetry is defined, in the phase-space of a quadratic in velocities constrained action, as a simultaneous conformal symmetry of the supermetric and the superpotential. It is proven that such a symmetry corresponds to a variational (Noe
Externí odkaz:
http://arxiv.org/abs/1208.0462
Autor:
Papadopoulos, G. O., Grammenos, Th.
An answer to the question: Can, in general, the adoption of a given symmetry induce a further symmetry, which might be hidden at a first level? has been attempted in the context of differential geometry of locally homogeneous spaces. Based on E. Cart
Externí odkaz:
http://arxiv.org/abs/1106.3897
Autor:
Christodoulakis, T., Doulis, G., Terzis, Petros A., Melas, E., Grammenos, Th., Papadopoulos, G. O., Spanou, A.
Publikováno v:
Class.Quant.Grav. 27 (2010) 145018
The 3+1 (canonical) decomposition of all geometries admitting two-dimensional space-like surfaces is exhibited. A proposal consisting of a specific re-normalization {\bf Assumption} and an accompanying {\bf Requirement} is put forward, which enables
Externí odkaz:
http://arxiv.org/abs/0901.4910
Autor:
Christodoulakis, T., Doulis, G., Terzis, Petros A, Melas, E., Grammenos, Th., Papadopoulos, G. O., Spanou, A.
Publikováno v:
Class.Quant.Grav.25:235014,2008
The canonical analysis and subsequent quantization of the (2+1)-dimensional action of pure gravity plus a cosmological constant term is considered, under the assumption of the existence of one spacelike Killing vector field. The proper imposition of
Externí odkaz:
http://arxiv.org/abs/0806.0137