Simulations with Complex Measure

Details Simulations with Complex Measure Simulations with Complex Measure

1996-10-03

arxiv.org/abs/hep-lat/9610006v2

Nucl.Phys. B516 (1998) 729-743

Physics

High Energy Physics

High Energy Physics - Lattice

18 pages, 13 Postscript figures, submitted to and revised for Nucl.Phys.B. Two figures are colour, but monochrome versions of

Scientific paper

10.1016/S0550-3213(97)00831-6

A method is proposed to handle the sign problem in the simulation of systems having indefinite or complex-valued measures. In general, this new approach, which is based on renormalisation blocking, is shown to yield statistical errors smaller than the crude Monte Carlo method using absolute values of the original measures. The improved method is applied to the 2D Ising model with temperature generalised to take on complex values. It is also adapted to implement Monte Carlo Renormalisation Group calculations of the magnetic and thermal critical exponents.

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