Zobrazeno 1 - 10
of 50
pro vyhledávání: '"Shirzad, Ahmad"'
General relativity contains 16 variables in the framework of ADM-Vielbein formalism which are 6 more than metric formalism. These variables emerge due to additional symmetry of Local Lorentz Transformations. In the framework of the Hamiltonian approa
Externí odkaz:
http://arxiv.org/abs/2412.00128
Autor:
Molaee, Zahra, Shirzad, Ahmad
We present a new Lagrangian approach for the dynamical structure of the generalized Proca theory (GP). This approach includes the A-Z constraint structure of the model in the Lagrangian formalism and ends up with an accurate count of the number of de
Externí odkaz:
http://arxiv.org/abs/2307.02384
Autor:
Jalali, Rezvan, Shirzad, Ahmad
We study the constraint structure of Fierz -Pauli action in both flat and curved space in the framework of Hamiltonian formalism. We observe an abrupt change in the constraint algebra and the characteristics of the constraints when the mass term is t
Externí odkaz:
http://arxiv.org/abs/2010.04503
A detailed program is proposed in the Lagrangian formalism to investigate the dynamical behavior of a theory with singular Lagrangian. This program goes on, at different levels, parallel to the Hamiltonian analysis. In particular, we introduce the no
Externí odkaz:
http://arxiv.org/abs/2003.13269
Following the Hamiltonian structure of bi-gravity and multi-gravity models in the full phase space, we have constructed the generating functional of diffeomorphism gauge symmetry. As is expected, this generator is constructed from the first class con
Externí odkaz:
http://arxiv.org/abs/2001.10947
Autor:
Molaee, Zahra, Shirzad, Ahmad
Publikováno v:
2021 Class. Quantum Grav. 38 065006
We study the Hamiltonian structure of tri-gravity and four-gravity in the framework of ADM decomposition of the corresponding metrics. Hence we can deduce the general structure of the constraint system of multi-gravity. We will show it is possible an
Externí odkaz:
http://arxiv.org/abs/1908.05041
Autor:
Bakhshaei, Elaheh, Shirzad, Ahmad
In the framework of the AdS/CFT correspondence, imposing a scalar field in the bulk space-time leads to deform the corresponding CFT in the boundary, which may produce corrections to entanglement entropy, as well as the so-called subregion complexity
Externí odkaz:
http://arxiv.org/abs/1902.02504
Autor:
Molaee, Zahra, Shirzad, Ahmad
We analyze the Hamiltonian structure of a general theory of bi-gravity where the interaction term is a scalar function of the form $ V(\mathcal{X}^{n}) $ where $ \mathcal{X} $ may be $\sqrt{g^{-1}f} $ or $ g^{-1}f $. We give necessary conditions for
Externí odkaz:
http://arxiv.org/abs/1805.02179
Autor:
Molaee, Zahra, Shirzad, Ahmad
Publikováno v:
Nucl. Phys. B, 933, 2018, 248-261
Performing Hamiltonian analysis of the massive gravity [9] in full phase space, we see that the theory is ghost free. We also see in a more clear way that this result is intrinsic of the interaction term and does not depend on the variables involved.
Externí odkaz:
http://arxiv.org/abs/1709.04847