Zobrazeno 1 - 10
of 329
pro vyhledávání: '"Langfeld, K."'
Recently, a novel algorithm for computing the density of states in statistical systems and quantum field theories has been proposed. The same method can be applied to theories at finite density affected by the notorious sign problem, reducing a high-
Externí odkaz:
http://arxiv.org/abs/1601.02929
Finite density quantum field theories have evaded first principle Monte-Carlo simulations due to the notorious sign-problem. The partition function of such theories appears as the Fourier transform of the generalised density-of-states, which is the p
Externí odkaz:
http://arxiv.org/abs/1503.00450
We present a novel algorithm to compute the density of states, which is proven to converge to the correct result. The algorithm is very general and can be applied to a wide range of models, in the frameworks of Statistical Mechanics and Lattice Gauge
Externí odkaz:
http://arxiv.org/abs/1411.0655
Autor:
Greensite, J., Langfeld, K.
Publikováno v:
Phys.Rev. D87, 094501 (2013)
We apply the relative weights method (arXiv:1209.5697) to determine the effective Polyakov line action for SU(2) lattice gauge theory in the confined phase, at lattice coupling beta=2.2 and N_t=4 lattice spacings in the time direction. The effective
Externí odkaz:
http://arxiv.org/abs/1301.4977
The frustrated Ising model on a two-dimensional lattice with open boundary conditions is revisited. A hidden Z2 gauge symmetry relates models with different frustrations which, however, share the same partition function. By means of a duality transfo
Externí odkaz:
http://arxiv.org/abs/1012.3699
Publikováno v:
Phys.Rev.D83:076013,2011
We develop a numerical formulation to calculate the classical motion of charges in strong electromagnetic fields, such as those occurring in high-intensity laser beams. By reformulating the dynamics in terms of SL(2,C) matrices representing the Loren
Externí odkaz:
http://arxiv.org/abs/1012.3082
Publikováno v:
Phys.Rev.D77:054501,2008
We consider two very different models of the flux tube linking two heavy quarks: a string linking the matter fields and a Coulombic description of two separately gauge invariant charges. We compare how close they are to the unknown true ground state
Externí odkaz:
http://arxiv.org/abs/0709.3486
Publikováno v:
Phys.Rev.D75:034501,2007
We argue that screening of higher-representation color charges by gluons implies a domain structure in the vacuum state of non-abelian gauge theories, with the color magnetic flux in each domain quantized in units corresponding to the gauge group cen
Externí odkaz:
http://arxiv.org/abs/hep-lat/0609050
The frustrated Ising model in two dimensions is revisited. The frustration is quantified in terms of the number of non-trivial plaquettes which is invariant under the Nishimori gauge symmetry. The exact ground state energy is calculated using Edmond'
Externí odkaz:
http://arxiv.org/abs/hep-lat/0606009
The magnetic flux noise induced by vortices in thin superconducting films is studied. Rigid vortices in thin films as well as pancake vortices in the pancake gas regime are addressed. The vortex dynamics is described by a Feynman path integral which
Externí odkaz:
http://arxiv.org/abs/cond-mat/0511637