Spin models in complex magnetic fields: A hard sign problem

T. Rindlisbacher, P. De Forcrand, Pena Ruano C. Gamiz Sanchez E. (Redaktör), Della Morte M. Fritzsch P. (Redaktör)

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskapligPeer review


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. In this study, we couple the N-state Potts model in different ways to a complex external magnetic field and discuss the above mentioned phenomena and their relations based on analytic calculations (1D) and results obtained using a modified cluster algorithm (general D) that in many cases either cures or at least drastically reduces the sign-problem induced by the complex external field. © The Authors, published by EDP Sciences, 2018.
Titel på gästpublikation35th International Symposium on Lattice Field Theory (Lattice 2017)
RedaktörerM. Della Morte, P. Fritzsch, E. Gámiz Sánchez , C. Pena Ruan
Antal sidor8
UtgivningsortLes Ulis
FörlagEDP sciences
StatusPublicerad - 2018
MoE-publikationstypA4 Artikel i en konferenspublikation
EvenemangInternational Symposium on Lattice Field Theory - Granada, Spanien
Varaktighet: 18 jun 201724 jun 2017
Konferensnummer: 35th


NamnEPJ Web of Conferences
ISSN (tryckt)2101-6275


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