Zobrazeno 1 - 10
of 954
pro vyhledávání: '"minisuperspace model"'
Autor:
Kuzmichev, V. E., Kuzmichev, V. V.
An analogy between non-relativistic quantum mechanics in the Madelung formulation and quantum geometrodynamics in the case of the maximally symmetric space is drawn. The equations equivalent to the continuity equation and the hydrodynamic Euler equat
Externí odkaz:
http://arxiv.org/abs/2410.21095
Publikováno v:
Universe 2023, 9(12), 508
Grassmann variables are used to formally transform a system with constraints into an unconstrained system. As a result, the Schr\"{o}dinger equation arises instead of the Wheeler-DeWitt one. The Schr\"{o}dinger equation describes a system's evolution
Externí odkaz:
http://arxiv.org/abs/2312.06618
Publikováno v:
Universe, Vol 9, Iss 12, p 508 (2023)
Grassmann variables are used to formally transform a system with constraints into an unconstrained system. As a result, the Schrödinger equation arises instead of the Wheeler–DeWitt one. The Schrödinger equation describes a system’s evolution,
Externí odkaz:
https://doaj.org/article/11d055e875a84f32afbf9f45ea974c44
Publikováno v:
Phys. Rev. D 100, 043533 (2019)
The kinematical phase space of classical gravitational field is flat (affine) and unbounded. Because of this, field variables may tend to infinity leading to appearance of singularities, which plague Einstein's theory of gravity. The purpose of this
Externí odkaz:
http://arxiv.org/abs/1904.11338
Autor:
Khatsymovsky, V. M.
Publikováno v:
Mod. Phys. Lett. A, Vol. 30, No. 32 (2015) 1550172
Faddeev formulation of general relativity (GR) is considered where the metric is composed of ten vector fields or a ten-dimensional tetrad. Upon partial use of the field equations, this theory results in the usual GR. Earlier we have proposed some mi
Externí odkaz:
http://arxiv.org/abs/1508.07573
Autor:
Benedetti, Dario, Henson, Joe
Publikováno v:
Class. Quantum Grav. 32 (2015) 215007
A spacetime condensation phenomenon underlies the emergence of a macroscopic universe in causal dynamical triangulations, where the time extension of the condensate is strictly smaller than the total time. It has been known for some time that the vol
Externí odkaz:
http://arxiv.org/abs/1410.0845
Autor:
Khatsymovsky, V. M.
Publikováno v:
Mod. Phys. Lett. A, Vol. 29, No. 27 (2014) 1450141
We consider Faddeev formulation of general relativity in which the metric is composed of ten vector fields or a $4 \times 10$ tetrad. This formulation reduces to the usual general relativity upon partial use of the field equations. A distinctive feat
Externí odkaz:
http://arxiv.org/abs/1408.6375
Autor:
Anderson, Edward
Publikováno v:
Gen. Rel. Grav 46 (2014) 1708
A local resolution to the Problem of Time that is Machian and was previously demonstrated for various relational mechanics models is here shown to work for a more widely studied quantum cosmological model. Namely, closed isotropic minisuperspace GR w
Externí odkaz:
http://arxiv.org/abs/1307.1916
Autor:
Vakili, Babak
Publikováno v:
Ann. Phys. (Berlin) 19 (2010) 359
We study the metric $f(R)$ cosmology using Noether symmetry approach by utilizing the behavior of the corresponding Lagrangian under infinitesimal generators of the desired symmetry. The existence of Noether symmetry of the cosmological $f(R)$ minisu
Externí odkaz:
http://arxiv.org/abs/1001.2959
Publikováno v:
Class.Quant.Grav.26:065003,2009
We study the effects of noncommutativity and deformed Heisenberg algebra on the evolution of a two dimensional minisuperspace cosmological model in classical and quantum regimes. The phase space variables turn out to correspond to the scale factor of
Externí odkaz:
http://arxiv.org/abs/0901.3829