Spin models in complex magnetic fields: a hard sign problem

31 Oct 2017 de Forcrand Philippe Rindlisbacher Tobias

Coupling spin models to complex external fields can give rise to interesting phenomena like zeroes of the partition function (Lee-Yang zeroes, edge singularities) or oscillating propagators. Unfortunately, it usually also leads to a severe sign problem that can be overcome only in special cases; if the partition function has zeroes, the sign problem is even representation-independent at these points... (read more)

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