Zobrazeno 1 - 10
of 386
pro vyhledávání: '"Gambini, R."'
We study the "improved dynamics" for the treatment of spherically symmetric space-times in loop quantum gravity introduced by Chiou {\em et al.} in analogy with the one that has been constructed by Ashtekar, Pawlowski and Singh for the homogeneous sp
Externí odkaz:
http://arxiv.org/abs/2006.01513
Publikováno v:
Gen.Rel.Grav. 38 (2006) 593-598
We reconsider the unified model of gravitation and Yang--Mills interactions proposed by Chakraborty and Peld\'an, in the light of recent formal developments in loop quantum gravity. In particular, we show that one can promote the Hamiltonian constrai
Externí odkaz:
http://arxiv.org/abs/gr-qc/0409045
Publikováno v:
Phys.Rev.Lett.84:2314-2317,2000
We present a quantization of the Hamiltonian and diffeomorphism constraint of canonical quantum gravity in the spin network representation. The novelty consists in considering a space of wavefunctions based on the Vassiliev knot invariants. The const
Externí odkaz:
http://arxiv.org/abs/gr-qc/9909063
Publikováno v:
Phys.Rev. D59 (1999) 047505
We draw parallels between the recently introduced ``Immirzi ambiguity'' of the Ashtekar-like formulation of canonical quantum gravity and other ambiguities that appear in Yang-Mills theories, like the $\theta$ ambiguity. We also discuss ambiguities i
Externí odkaz:
http://arxiv.org/abs/gr-qc/9801055
Publikováno v:
Phys.Rev. D57 (1998) 3711-3724
Variables parametrized by closed and open curves are defined to reformulate compact U(1) Quantum Electrodynamics in the circle with a massless fermion field. It is found that the gauge invariant nature of these variables accommodates into a regulariz
Externí odkaz:
http://arxiv.org/abs/hep-th/9712096
Autor:
Fort, H., Gambini, R.
We show how the gauge invariant formulation of QCD in terms of loops is free from a hidden $\theta$ parameter and offers an alternative way to solve the $U(1)_A$ puzzle.
Comment: 4 pages, revtex
Comment: 4 pages, revtex
Externí odkaz:
http://arxiv.org/abs/hep-th/9711174
Publikováno v:
Phys.Lett. B425 (1998) 41-47
We apply the ideas of Alvarez and Labastida to the invariant of spin networks defined by Witten and Martin based on Chern-Simons theory. We show that it is possible to define ambient invariants of spin networks that (for the case of SU(2)) can be con
Externí odkaz:
http://arxiv.org/abs/q-alg/9711014
Publikováno v:
Phys.Rev. D58 (1998) 045007
A gauge invariant Hamiltonian representation for SU(2) in terms of a spin network basis is introduced. The vectors of the spin network basis are independent and the electric part of the Hamiltonian is diagonal in this representation. The correspondin
Externí odkaz:
http://arxiv.org/abs/hep-lat/9703007
The worldsheet formulation is introduced for lattice gauge theories with dynamical fermions. The partition function of lattice compact QED with staggered fermions is expressed as a sum over surfaces with border on self-avoiding fermionic paths. The s
Externí odkaz:
http://arxiv.org/abs/hep-lat/9607050
Publikováno v:
Phys.Rev. D54 (1996) 7751-7756
We show how the Hamiltonian lattice loop representation can be cast straightforwardly in the path integral formalism. The procedure is general for any gauge theory. Here we present in detail the simplest case: pure compact QED. We also analyze the no
Externí odkaz:
http://arxiv.org/abs/hep-th/9605068