Physics – Condensed Matter
Scientific paper
1992-11-17
Phys.Rev.B48:589,1993
Physics
Condensed Matter
11 pages TeX, 2 figures upon request
Scientific paper
10.1103/PhysRevB.48.589
We discuss the Fermion sign problem and, by examining a very general Hubbard-Stratonovich (HS) transformation, argue that the sign problem cannot be solved with such methods. We propose a different kind of transformation which, while not solving the sign problem, shows more detailed information about the system. With our transformation it is {\it trivial} to tell which auxiliary field configurations give a positive sign and which give a negative sign. We then discuss briefly various properties of this transformation and construct a new algorithm which with one simulation gives results for a whole range of particle densities and Hubbard $U$ values, positive and negative. Our approach is in excellent agreement with exact calculations.
Batrouni Ghassan George
Forcrand Philippe de
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