Fermion bag approach to fermion sign problems
نویسندگان
چکیده
منابع مشابه
The generalized fermion-bag approach
We present a new approach to some four-fermion lattice field theories which we call the generalized fermion bag approach. The basic idea is to identify unpaired fermionic degrees of freedom that cause sign problems and collect them in a bag. Paired fermions usually act like bosons and do not lead to sign problems. A resummation of all unpaired fermion degrees of freedom inside the bag is suffic...
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We propose a new approach to the fermion sign problem in systems where there is a coupling U such that when it is infinite the fermions are paired into bosons, and there is no fermion permutation sign to worry about. We argue that as U becomes finite, fermions are liberated but are naturally confined to regions which we refer to as fermion bags. The fermion sign problem is then confined to thes...
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S.-X. Yang,1,2,* P. Haase,3 H. Terletska,1,4 Z. Y. Meng,1,2 T. Pruschke,3 J. Moreno,1,2 and M. Jarrell1,2 1Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA 2Center for Computation and Technology, Louisiana State University, Baton Rouge, Louisiana 70803, USA 3Department of Physics, University of Göttingen, 37077 Göttingen, Germany 4Condensed Matt...
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We review a recently proposed approach to the problem of alternating signs for fermionic many body Monte Carlo simulations in finite temperature simulations. We derive an estimate for fermion wandering lengths and introduce the notion of permutation zones, special regions of the lattice where identical fermions may interchange and outside of which they may not. Using successively larger permuta...
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ژورنال
عنوان ژورنال: The European Physical Journal A
سال: 2013
ISSN: 1434-6001,1434-601X
DOI: 10.1140/epja/i2013-13090-y