HEP Lattice·hep-lat
8 papers—8 primary·0 cross-listed·reconstructed*
Anna Hasenfratz🇺🇸 · Andrei Alexandru🇺🇸
We discuss several methods that improve the partial-global stochastic Metropolis (PGSM) algorithm for smeared link staggered fermions. We present autocorrelation time measurements and argue that this update is feasible even on reasonably large lattices.
K. Kajantie🇫🇮 · M. Laine🇨🇭 · K. Rummukainen🇸🇪 · Y. Schroder🇺🇸
We discuss the logarithmic contributions to the vacuum energy density of the three-dimensional SU(3) + adjoint Higgs theory in its symmetric phase, and relate them to numerical Monte Carlo simulations. We also comment on the implications of these results for perturbative and non-perturbative determinations of the pressure of finite-temperature QCD.
CP-PACS Collaboration: Y. Namekawa🇯🇵 · S. Aoki🇯🇵 · M. Fukugita🇯🇵 · K-I. Ishikawa🇯🇵 · N. Ishizuka🇯🇵 · Y. Iwasaki🇯🇵 · K. Kanaya🇯🇵 · T. Kaneko🇯🇵 · Y. Kuramashi🇯🇵 · V.I. Lesk🇯🇵 · M. Okawa🇯🇵 · Y. Taniguchi🇯🇵 and 3 other authors
We explore the region of small sea quark masses below in two-flavor QCD using a mean-field improved clover quark action and an RG-improved gauge action at fm on and lattices. We find that instability of the standard BiCGStab algorithm at small quark masses can be mostly removed by the BiCGStab(DS-) algorithm, which employs -th minimal residual polynomials with a dynamical selection of . We also find singular spikes of in the HMC algorithm at moderate values of . Nature of the spike is studied. We also study finite-size effects and chiral properties of meson masses.
C. Alexandrou (Univ. of Cyprus)🇨🇾 · Ph. de Forcrand (CERN and ETH Zurich)🇨🇭 · Th. Lippert (Univ. of Wuppertal)🇩🇪 · H. Neff (Univ. of Athens)🇬🇷 · J. W. Negele (MIT)🇺🇸 · K. Schilling (Univ. of Wuppertal)🇩🇪 · W. Schroers (MIT)🇺🇸 · A. Tsapalis (Univ. of Wuppertal)🇩🇪
We present results on the ratio of electric quadrupole to magnetic dipole amplitudes, , for the transition from lattice QCD. We consider both the quenched and the 2-flavor theory.
P.Yu. Boyko🇷🇺 · M.I. Polikarpov🇷🇺 · V.I. Zakharov🇩🇪
We perform detailed measurements of the geometrical characteristics of the percolating cluster of the magnetic monopole currents in the confining phase of the lattice SU(2) gluodynamics. The Maximal Abelian projection is used to define the monopoles. The use of the geometrical language is motivated by recent observations that the full non-Abelian action associated with the monopoles corresponds to point-like particles on the currently available lattices. Scaling behavior of various quantities is observed.
The strong coupling constant alpha_s(mu_0), taken at a fixed reference scale mu_0, is the single free parameter of QCD and should be known to the highest available precision. The value of alpha_s should also be determined with good accuracy over as large a range of scales as possible, in order to reveal potential anomalous running in the strength of the strong interaction. Lattice QCD is now able to calculate alpha_s with accuracy comparable to or better than experiment. We review the status of such lattice calculations in quenched and full QCD.
J. Hein🇬🇧 · C. Davies🇬🇧 · G.P. Lepage🇺🇸 · Q. Mason🇺🇸 · H. Trottier🇨🇦
We present results on the sum of the masses of light and strange quark using improved staggered quarks. Our calculation uses 2+1 flavours of dynamical quarks. The effects of the dynamical quarks are clearly visible.
Jochen Heitger🇩🇪 · Martin Kurth🇬🇧 · Rainer Sommer🇩🇪
We non-perturbatively calculate the renormalization factor of the static axial vector current in O(a) improved quenched lattice QCD. Its scale dependence is mapped out in the Schroedinger functional scheme by means of a recursive finite-size scaling technique, taking the continuum limit in each step. We also obtain Z_A^{stat} for Wilson fermions in order to renormalize existing unimproved data on F_B^{bare} non-perturbatively.
* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.