Comparison of exact hybrid and Langevin algorithms for QCD with Kogut-Susskind fermions

Journal Article · Fri Nov 15 04:00:00 EST 1991 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.44.3254· OSTI ID:5993341

Vaccarino, A ^[1]

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1. Department of Physics, Columbia University, New York, New York (USA)

We find that the exact hybrid algorithm in simulating QCD with four flavors of Kogut-Susskind fermions at {ital N}{sub {ital t}}=4, with {ital m}{sub {ital q}a}=0.025 in lattice units, is significantly more efficient than the exact Langevin algorithm, by at least a factor of 10. Comparing the integrated autocorrelation time for the plaquette {tau}{sup {ital A}} and the Wilson line {tau}{sup WI} on a 4{sup 4} lattice, we find for the exact hybrid algorithm {tau}{sup {ital A}}{similar to}10 and {tau}{sup WI}{similar to}30, while for the exact Langevin algorithm {tau}{sup {ital A}}{similar to}150 and {tau}{sup WI}{similar to}300. On a 16{sup 3}{times}4 lattice, even if we were not able to collect enough statistics to measure the autocorrelation times reliably, the exact hybrid algorithm appears again to be more efficient by one order of magnitude.

• OSTI ID: 5993341
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 44:10; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662110* -- General Theory of Particles & Fields-- Theory of Fields & Strings-- (1992-)
662230 -- Quantum Chromodynamics-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALGORITHMS
COMPOSITE MODELS
DIRAC OPERATORS
EIGENVALUES
EQUATIONS
FERMIONS
FIELD THEORIES
FLAVOR MODEL
LANGEVIN EQUATION
LATTICE FIELD THEORY
MATHEMATICAL LOGIC
MATHEMATICAL MODELS
MATHEMATICAL OPERATORS
MONTE CARLO METHOD
PARTICLE MODELS
PROBABILITY
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUANTUM OPERATORS
QUARK MODEL