24,325 research outputs found
Palindromic 3-stage splitting integrators, a roadmap
The implementation of multi-stage splitting integrators is essentially the
same as the implementation of the familiar Strang/Verlet method. Therefore
multi-stage formulas may be easily incorporated into software that now uses the
Strang/Verlet integrator. We study in detail the two-parameter family of
palindromic, three-stage splitting formulas and identify choices of parameters
that may outperform the Strang/Verlet method. One of these choices leads to a
method of effective order four suitable to integrate in time some partial
differential equations. Other choices may be seen as perturbations of the
Strang method that increase efficiency in molecular dynamics simulations and in
Hybrid Monte Carlo sampling.Comment: 20 pages, 8 figures, 2 table
Towards the lattice study of M-theory
We propose the Wilson discretization of the supersymmetric Yang-Mills Quantum
Mechanics as a lattice version of the matrix model of M-theory. An SU(2) model
is studied numerically in the quenched approximation for D=4. A clear signal
for the existence of two different phases is found and the continuum
pseudocritical temperature is determined. We have also extracted the continuum
limit of the total size of the system in both phases and for different
temperatures.Comment: Lattice 2000 (Gravity and Matrix Models
Study of the order of the phase transition in pure U(1) gauge theory with Villain action
We address the question of the order of the deconfinement phase transition of
four dimensional U(1) lattice gauge theory. Simulations of the Z-gauge theory
dual to the Villain action on toroidal lattices up to lattice sizes of 28^4
give results consistent with both, a vanishing and a nonvanishing discontinuity
in the thermodynamic limit. A decision on the order of the phase transition
requires still larger lattice sizes.Comment: LATTICE98(gauge), 3 pages, 2 figure
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