Zobrazeno 1 - 10
of 631
pro vyhledávání: '"Hamiltonian constraint"'
Autor:
Martin Bojowald, Artur Tsobanjan
Publikováno v:
Quantum Reports, Vol 5, Iss 1, Pp 22-37 (2022)
Quantum reference frames are expected to differ from classical reference frames because they have to implement typical quantum features such as fluctuations and correlations. Here, we show that fluctuations and correlations of reference variables, in
Externí odkaz:
https://doaj.org/article/cbb676cab2454b6c9f14444c324f15de
Autor:
You Ding, Xiangdong Zhang
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 8 (2022)
The loop quantum cosmological model from ADM Hamiltonian is studied in this article. We consider the spatially flat homogeneous FRW model. It turns out that the modified Friedmann equation keeps the same form as the APS LQC model. However, the critic
Externí odkaz:
https://doaj.org/article/4fa5872a13f34e45a7e6c691ae3080d2
Autor:
Behzad Tajahmad
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 77, Iss 4, Pp 1-11 (2017)
Abstract In this paper, we present the Noether symmetries of flat FRW spacetime in the context of a new action in teleparallel gravity which we construct based on the f(R) version. This modified action contains a coupling between the scalar field pot
Externí odkaz:
https://doaj.org/article/fd84e953684246e9b5774f8f589f6374
Autor:
Vesselin G. Gueorguiev, Andre Maeder
Publikováno v:
Symmetry, Vol 13, Iss 3, p 522 (2021)
In this paper, we argue in favor of first-order homogeneous Lagrangians in the velocities. The relevant form of such Lagrangians is discussed and justified physically and geometrically. Such Lagrangian systems possess Reparametrization Invariance (RI
Externí odkaz:
https://doaj.org/article/1cbc419467f6407b8e7be8fb7c3bcd1f
Autor:
Carlip, Steven, author
Publikováno v:
General Relativity : A Concise Introduction, 2019, ill.
Externí odkaz:
https://doi.org/10.1093/oso/9780198822158.003.0012
Publikováno v:
Odessa Astronomical Publications; Vol. 35 (2022); 4-9
Odessa Astronomical Publications; Том 35 (2022); 4-9
Odessa Astronomical Publications; Том 35 (2022); 4-9
Geometrodynamics of charged black holes (BH) described by the system of Maxwell Einstein equations is considered. We start from a spherically symmetric metric, a reduced action, and a Lagrangian written in characteristic variables. The configuration
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Autor:
Philipp A. Höhn
Publikováno v:
Universe, Vol 5, Iss 5, p 116 (2019)
Despite its importance in general relativity, a quantum notion of general covariance has not yet been established in quantum gravity and cosmology, where, given the a priori absence of coordinates, it is necessary to replace classical frames with dyn
Externí odkaz:
https://doaj.org/article/fae9ed564ee447469cb7cfd3b05f6a66
Autor:
Deniz Olgu Devecioglu, Mu-In Park
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 7, Pp 1-16 (2020)
European Physical Journal
European Physical Journal
We consider the Hamiltonian formulation of Horava gravity in arbitrary dimensions, which has been proposed as a renormalizable gravity model for quantum gravity without the ghost problem. We study the "full" constraint analysis of the "non-projectabl
Autor:
Enrique Muñoz, Benjamin Koch
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 79, Iss 11, Pp 1-6 (2019)
European Physical Journal
European Physical Journal
Gauge theories with general covariance are particularly reluctant to quantization. We discuss the example of the Hamiltonian formulation of the relativistic point particle that, despite its apparent simplicity, is of crucial importance since a number