publication . Article . Preprint . 2010

Fermion bag approach to the sign problem in strongly coupled lattice QED with Wilson fermions

Shailesh Chandrasekharan; Anyi Li;
Open Access
  • Published: 30 Aug 2010 Journal: Journal of High Energy Physics, volume 2,011 (eissn: 1029-8479, Copyright policy)
  • Publisher: Springer Science and Business Media LLC
Abstract
We explore the sign problem in strongly coupled lattice QED with one flavor of Wilson fermions in four dimensions using the fermion bag formulation. We construct rules to compute the weight of a fermion bag and show that even though the fermions are confined into bosons, fermion bags with negative weights do exist. By classifying fermion bags as either simple or complex, we find numerical evidence that complex bags with positive and negative weights come with almost equal probabilities and this leads to a severe sign problem. On the other hand simple bags mostly have a positive weight. Since the complex bags almost cancel each other, we suggest that eliminating ...
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Subjects
arXiv: High Energy Physics::Lattice
free text keywords: Nuclear and High Energy Physics, High Energy Physics - Lattice, Fermion doubling, Lattice QCD, Meron, Physics, Lattice (order), Partition function (statistical mechanics), Theoretical physics, Boson, Quantum chromodynamics, Fermion, Particle physics
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