Zobrazeno 1 - 10
of 34
pro vyhledávání: '"Thorleifsson G"'
Publikováno v:
Phys. Rev. Lett. 87 (2001) 148103
We determine the Poisson ratio of self-avoiding fixed-connectivity membranes, modeled as impenetrable plaquettes, to be sigma=-0.37(6), in statistical agreement with the Poisson ratio of phantom fixed-connectivity membranes sigma=-0.32(4). Together w
Externí odkaz:
http://arxiv.org/abs/cond-mat/0103173
Publikováno v:
Nucl.Phys.Proc.Suppl. 83 (2000) 757-759
We investigate the weak-coupling limit, kappa going to infinity, of 3D simplicial gravity using Monte Carlo simulations and a Strong Coupling Expansion. With a suitable modification of the measure we observe a transition from a branched polymer to a
Externí odkaz:
http://arxiv.org/abs/hep-lat/9910003
Publikováno v:
Nucl.Phys. B550 (1999) 465-491
In the weak-coupling limit, kappa_0 going to infinity, the partition function of simplicial quantum gravity is dominated by an ensemble of triangulations with the ratio N_0/N_D close to the upper kinematic limit. For a combinatorial triangulation of
Externí odkaz:
http://arxiv.org/abs/hep-lat/9812022
Autor:
Bilke, S., Thorleifsson, G.
Publikováno v:
Phys.Rev. D59 (1999) 124008
We extend a model of four-dimensional simplicial quantum gravity to include degenerate triangulations in addition to combinatorial triangulations traditionally used. Relaxing the constraint that every 4-simplex is uniquely defined by a set of five di
Externí odkaz:
http://arxiv.org/abs/hep-lat/9810049
Autor:
Bilke, S., Thorleifsson, G.
Publikováno v:
Nucl.Phys.Proc.Suppl. 73 (1999) 801-803
We extend simulations of simplicial gravity in four dimensions to include {\it degenerate} triangulations and demonstrate that using this ensemble the geometric finite-size effects are much reduced. We provide strong numerical evidence for the existe
Externí odkaz:
http://arxiv.org/abs/hep-lat/9809106
Publikováno v:
Nucl.Phys.Proc.Suppl. 73 (1999) 804-806
We describe the statistical behavior of anisotropic crystalline membranes. In particular we give the phase diagram and critical exponents for phantom membranes and discuss the generalization to self-avoiding membranes.
Comment: LATTICE98(surface
Comment: LATTICE98(surface
Externí odkaz:
http://arxiv.org/abs/hep-lat/9809112
Autor:
Bilke, S., Burda, Z., Krzywicki, A., Petersson, B., Petrov, K., Tabaczek, J., Thorleifsson, G.
Publikováno v:
Nucl.Phys.Proc.Suppl. 73 (1999) 798-800
We construct the strong-coupling series in 4d simplicial quantum gravity up to volume 38. It is used to calculate estimates for the string susceptibility exponent gamma for various modifications of the theory. It provides a very efficient way to get
Externí odkaz:
http://arxiv.org/abs/hep-lat/9809088
Publikováno v:
J.Statist.Phys. 94 (1999) 321-345
We study with Monte Carlo methods an ensemble of c=-5 gravity graphs, generated by coupling a conformal field theory with central charge c=-5 to two-dimensional quantum gravity. We measure the fractal properties of the ensemble, such as the string su
Externí odkaz:
http://arxiv.org/abs/cond-mat/9804137
Publikováno v:
Phys.Lett. B432 (1998) 279-286
Four-dimensional simplicial quantum gravity is modified either by coupling it to U(1) gauge fields or by introducing a measure weighted by the orders of the triangles. Strong coupling expansion and Monte Carlo simulations are used. Although the two m
Externí odkaz:
http://arxiv.org/abs/hep-lat/9804011
Publikováno v:
Phys.Lett. B418 (1998) 266-272
The effect of coupling non-compact $U(1)$ gauge fields to four dimensional simplicial quantum gravity is studied using strong coupling expansions and Monte Carlo simulations. For one gauge field the back-reaction of the matter on the geometry is weak
Externí odkaz:
http://arxiv.org/abs/hep-lat/9710077