Zobrazeno 1 - 10
of 122
pro vyhledávání: '"Ulli Wolff"'
Autor:
Ulli Wolff
Publikováno v:
Nuclear Physics B, Vol 955, Iss , Pp 115061- (2020)
We show the equivalence of the 2D Ising model to standard free Euclidean lattice fermions of the Wilson Majorana type. The equality of the loop representations for the partition functions of both systems is established exactly for finite lattices wit
Externí odkaz:
https://doaj.org/article/76d258033b5f450fae184e2b0cde314b
Publikováno v:
Journal of High Energy Physics, Vol 2018, Iss 6, Pp 1-20 (2018)
Abstract We discuss the problem of lattice artefacts in QCD simulations enhanced by the introduction of dynamical charmed quarks. In particular, we advocate the use of a massive renormalization scheme with a close to realistic charm mass. To maintain
Externí odkaz:
https://doaj.org/article/902154b4371c494e89f76172e4675e05
Publikováno v:
Journal of High Energy Physics, Vol 2020, Iss 10, Pp 1-2 (2020)
We correct for typos and add a few missing details that can help to reproduce our calculations. The results of our original paper remain unchanged.
Externí odkaz:
https://doaj.org/article/ac14ff7919614228a292cb2038c7e0eb
Autor:
Ulli Wolff, Johannes Siefert
Publikováno v:
Physics Letters B. 733:11-14
We study the standard one-component φ 4 -theory in four dimensions. A renormalized coupling is defined in a finite size renormalization scheme which becomes the standard scheme of the broken phase for large volumes. Numerical simulations are reporte
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::47226485d62d8ba0205e536c1955c1cb
https://doi.org/10.1016/j.physletb.2014.04.013
https://doi.org/10.1016/j.physletb.2014.04.013
Autor:
Ulli Wolff, Ferenc Niedermayer
We study the O(3) sigma model in $D=2$ on the lattice with a Boltzmann weight linearized in $\beta$ on each link. While the spin formulation now suffers from a sign-problem the equivalent loop model remains positive and becomes particularly simple. B
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::53b6f8b40eea151b9878844ddaa7e99b
http://arxiv.org/abs/1612.00621
http://arxiv.org/abs/1612.00621
Autor:
Ulli Wolff, Tomasz Korzec
Publikováno v:
Nuclear Physics B. 871:145-163
We exactly rewrite the Z(2) lattice gauge theory with standard plaquette action as a random surface model equivalent to the untruncated set of its strong coupling graphs. By extending the worm approach applied to spin models we simulate such surfaces
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::70be30cabf85d462e07b59fc1e2bda90
https://doi.org/10.1016/j.nuclphysb.2013.02.012
https://doi.org/10.1016/j.nuclphysb.2013.02.012
Autor:
Ulli Wolff, Matthijs Hogervorst
Publikováno v:
Nuclear Physics B. 855:885-900
Worm methods to simulate the Ising model in the Aizenman random current representation including a low noise estimator for the connected four point function are extended to allow for antiperiodic boundary conditions. In this setup several finite size
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::daf92b3ed4f268d7281db1ea199fcf9b
https://doi.org/10.1016/j.nuclphysb.2011.10.028
https://doi.org/10.1016/j.nuclphysb.2011.10.028
Autor:
Ulli Wolff, Peter Weisz
Publikováno v:
Nuclear Physics B. 846:316-337
We study a renormalized coupling g and mass m in four-dimensional ϕ 4 theory on tori with finite size z = m L . Precise numerical values close to the continuum limit are reported for z = 1 , 2 , 4 , based on Monte Carlo simulations performed in the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::03e9e906fec60d86bfaf24816738a9cd
https://doi.org/10.1016/j.nuclphysb.2011.01.006
https://doi.org/10.1016/j.nuclphysb.2011.01.006
Autor:
Ulli Wolff
Publikováno v:
Nuclear Physics B. 832:520-537
We exactly reformulate the lattice CP ( N − 1 ) spin model on a D -dimensional torus as a loop model whose configurations correspond to the complete set of strong coupling graphs of the original system. A Monte Carlo algorithm is described and test
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ee1cab5fa28d050627c08e7ec20239a9
https://doi.org/10.1016/j.nuclphysb.2010.02.005
https://doi.org/10.1016/j.nuclphysb.2010.02.005
Publikováno v:
Physics letters / B 683, 75-79 (2010). doi:10.1016/j.physletb.2009.11.055
Red Report (2009).
Red Report (2009).
We have determined the non-perturbative O(a)-improvement coefficient c_sw for four flavors of Wilson quarks with the plaquette gauge action in a range of beta >= 5. The data are fitted with several Pade approximation formulae to get an impression of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::42144b9f40c8cc60bb4c646396803bfe
https://doi.org/10.1016/j.physletb.2009.11.055
https://doi.org/10.1016/j.physletb.2009.11.055