Zobrazeno 1 - 10
of 645
pro vyhledávání: '"Dereli T"'
Autor:
Dereli, T., Yetismisoglu, C.
Publikováno v:
Phys. Rev. D 94, 064067 (2016)
We derive the field equations for topologically massive gravity coupled with the most general quadratic curvature terms using the language of exterior differential forms and a first order constrained variational principle. We find variational field e
Externí odkaz:
http://arxiv.org/abs/1604.00463
Autor:
Dereli, T., Sert, O.
Publikováno v:
Phys.Rev.D83:065005,2011
We give the Lagrangian formulation of a generic non-minimally extended Einstein-Maxwell theory with an action that is linear in the curvature and quadratic in the electromagnetic field. We derive the coupled field equations by a first order variation
Externí odkaz:
http://arxiv.org/abs/1101.1177
Publikováno v:
Physics Letters B 703 (4), 530-535, 2011
A generalization of Born-Infeld non-linear vacuum electrodynamics involving axion and dilaton fields is constructed with couplings dictated by electromagnetic duality and SL(2,R) symmetries in the weak field limit. Besides the Newtonian gravitational
Externí odkaz:
http://arxiv.org/abs/1012.4995
Einstein-Cartan theory is formulated in (1+2)-dimensions using the algebra of exterior differential forms. A Dirac spinor is coupled to gravity and the field equations are obtained by a variational principle. The space-time torsion is found to be giv
Externí odkaz:
http://arxiv.org/abs/1002.0958
Autor:
Dereli, T., Tucker, R. W.
The electromagnetic fields in Maxwell's theory satisfy linear equations in the classical vacuum. This is modified in classical non-linear electrodynamic theories. To date there has been little experimental evidence that any of these modified theories
Externí odkaz:
http://arxiv.org/abs/1001.1282
Publikováno v:
Int. J. Mod. Phys. A, Vol: 24 (Issue: 25-26), 4769-4788, (2009)
Canonical transformation in a three-dimensional phase space endowed with Nambu bracket is discussed in a general framework. Definition of the canonical transformations is constructed as based on canonoid transformations. It is shown that generating f
Externí odkaz:
http://arxiv.org/abs/0904.3989
Publikováno v:
Int. J.Mod. Phys. A, Vol: 24 (Issue: 24), 4573-4587, (2009).
A conjecture in quantum mechanics states that any quantum canonical transformation can decompose into a sequence of three basic canonical transformations; gauge, point and interchange of coordinates and momenta. It is shown that if one attempts to co
Externí odkaz:
http://arxiv.org/abs/0904.3416
Autor:
Adak, M., Dereli, T.
Publikováno v:
Eur. Phys. J. C 72 (2012) 1979
Chern-Simons modified gravity models in 4-dimensions are shown to be special cases of low energy effective string models to first order in the string constant.
Comment: To appear in the European Physics Journal C
Comment: To appear in the European Physics Journal C
Externí odkaz:
http://arxiv.org/abs/0807.1832
Publikováno v:
Phys. Rev. A 76, 043616 (2007)
We study the quantum coherence properties of a finite sized atomic condensate using a toy-model and the thin spectrum model formalism. The decoherence time for a condensate in the ground state, nominally taken as a variational symmetry breaking state
Externí odkaz:
http://arxiv.org/abs/0709.4268
Publikováno v:
Class.Quant.Grav.24:3425-3436,2007
We examine the effective field equations that are obtained from the axi-dilaton gravity action with a second order Euler-Poincare term and a cosmological constant in all higher dimensions. We solve these equations for five-dimensional spacetimes poss
Externí odkaz:
http://arxiv.org/abs/gr-qc/0703011