Lattice QCD and Numerical Simulations

IFAE 2006 ◽  
2007 ◽  
pp. 43-49
Author(s):  
Raffaele Tripiccione
Keyword(s):  
Numerical Simulations ◽  
Lattice Qcd

LATTICE QCD CURRENT STATUS AND GOALS AT ONE TERAFLOPS

1994 ◽  
Vol 05 (02) ◽  
pp. 195-200
Author(s):  
CARLETON DeTAR
Keyword(s):  
Numerical Simulations ◽  
Quantum Chromodynamics ◽  
Lattice Qcd ◽  
Recent Progress ◽  
Current Status ◽  
Strong Interactions ◽  
Significant Progress ◽  
The Past

Through numerical simulations over the past decade we have made significant progress toward solving quantum chromodynamics (QCD), the widely accepted theory of the strong interactions. Quantitatively respectable results are beginning to emerge. We are also gaining new qualitative insights into the workings of the theory that will assist in the design and analysis of experiment. I give a few examples of recent progress in lattice QCD and discuss goals and prospects for computations using the coming generation of teraflops-scale supercomputers.

PROGRESS IN LATTICE QCD

2007 ◽  
Vol 22 (30) ◽  
pp. 5453-5463
Author(s):  
G. SCHIERHOLZ
Keyword(s):  
Numerical Simulations ◽  
Lattice Qcd ◽  
Present State ◽  
Recent Advances

Progress in Lattice QCD is slow, but steady. In this talk I shall review recent advances, both technical and numerical, and assess the present state of numerical simulations.

scholarly journals HIGH PRECISION LATTICE QCD MEETS EXPERIMENT

2004 ◽  
Vol 19 (06) ◽  
pp. 877-886 ◽  
Author(s):  
P. LEPAGE ◽  
C. DAVIES
Keyword(s):  
Numerical Simulations ◽  
Lattice Qcd ◽  
High Precision ◽  
Systematic Errors ◽  
Qcd Vacuum ◽  
Comparison With Experiment ◽  
B Factory

We review recent results in lattice QCD from numerical simulations that allow for a much more realistic QCD vacuum than has been possible before. Comparison with experiment for a variety of hadronic quantities gives agreement to within statistical and systematic errors of 3%. We discuss the implications of this for future calculations in lattice QCD, particularly those which will provide input for B-factory experiments.

ON THE BEHAVIOR OF DYNAMICAL QUARK-ANTIQUARK PAIRS IN EXTERNAL CHROMO-ELECTRIC FIELDS

1993 ◽  
Vol 08 (11) ◽  
pp. 1021-1027 ◽  
Author(s):  
A. N. IVANOV ◽  
N. I. TROITSKAYA ◽  
M. FABER ◽  
M. SCHALER ◽  
M. NAGY
Keyword(s):  
Field Strength ◽  
Electric Field ◽  
Numerical Simulations ◽  
Lattice Qcd ◽  
Electric Fields ◽  
Low Energy ◽  
Energy Approximation ◽  
Time Formulation ◽  
Dynamical Quark ◽  
The Continuum

The vacuum structure of QCD in an external chromo-electric field is investigated within the continuum space-time formulation of perturbative QCD and the extended NambuJona-Lasinio model, used as a low-energy approximation of QCD. We show that the density of dynamical quark-antiquark pairs decreases with increasing external chromoelectric field strength. These results are compared with recent numerical simulations of lattice QCD which indicate restoration of chiral symmetry in the vicinity of a static color

Direct Numerical Simulations of Gas–Liquid Multiphase Flows

2001 ◽  
Author(s):  
Grétar Tryggvason ◽  
Ruben Scardovelli ◽  
Stéphane Zaleski
Keyword(s):  
Numerical Simulations ◽  
Multiphase Flows ◽  
Direct Numerical Simulations

Saturation mechanism and generated viscosity in gravito-turbulent accretion disks

2020 ◽  
Vol 640 ◽  
pp. A53
Author(s):  
L. Löhnert ◽  
S. Krätschmer ◽  
A. G. Peeters
Keyword(s):  
Growth Rate ◽  
Numerical Simulations ◽  
Accretion Disks ◽  
Gravitational Instability ◽  
Turbulent Viscosity ◽  
Radial Distance ◽  
Maximum Growth ◽  
Wave Number ◽  
Radiative Cooling ◽  
Mixing Length

Here, we address the turbulent dynamics of the gravitational instability in accretion disks, retaining both radiative cooling and irradiation. Due to radiative cooling, the disk is unstable for all values of the Toomre parameter, and an accurate estimate of the maximum growth rate is derived analytically. A detailed study of the turbulent spectra shows a rapid decay with an azimuthal wave number stronger than ky−3, whereas the spectrum is more broad in the radial direction and shows a scaling in the range kx−3 to kx−2. The radial component of the radial velocity profile consists of a superposition of shocks of different heights, and is similar to that found in Burgers’ turbulence. Assuming saturation occurs through nonlinear wave steepening leading to shock formation, we developed a mixing-length model in which the typical length scale is related to the average radial distance between shocks. Furthermore, since the numerical simulations show that linear drive is necessary in order to sustain turbulence, we used the growth rate of the most unstable mode to estimate the typical timescale. The mixing-length model that was obtained agrees well with numerical simulations. The model gives an analytic expression for the turbulent viscosity as a function of the Toomre parameter and cooling time. It predicts that relevant values of α = 10−3 can be obtained in disks that have a Toomre parameter as high as Q ≈ 10.

CHARACTERIZATION OF SPLASH-PLATE ATOMIZERS USING NUMERICAL SIMULATIONS

2007 ◽  
Vol 17 (4) ◽  
pp. 347-380 ◽  
Author(s):  
Mohammad P. Fard ◽  
Denise Levesque ◽  
Stuart Morrison ◽  
Nasser Ashgriz ◽  
J. Mostaghimi
Keyword(s):  
Numerical Simulations
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