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Topological Susceptibility under Gradient Flow
Héctor Mejía-Díaz, Wolfgang Bietenholz, Krzysztof Cichy +4
We study the impact of the Gradient Flow on the topology in various models of lattice field theory. The topological susceptibility is measured directly, and by the slab…
Spin models in complex magnetic fields: a hard sign problem
Philippe de Forcrand, Tobias Rindlisbacher
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 pr…
Alternatives to the stochastic "noise vector" approach
Philippe de Forcrand, Benjamin Jaeger
Several important observables, like the quark condensate and the Taylor coefficients of the expansion of the QCD pressure with respect to the chemical potential, are based on the t…
Strong-Coupling Lattice QCD on Anisotropic Lattices
Philippe de Forcrand, Wolfgang Unger, Helvio Vairinhos
Anisotropic lattice spacings are mandatory to reach the high temperatures where chiral symmetry is restored in the strong coupling limit of lattice QCD. Here, we propose a simple c…
Topology in the 2d Heisenberg Model under Gradient Flow
Ilya O. Sandoval, Wolfgang Bietenholz, Philippe de Forcrand +2
The 2d Heisenberg model --- or 2d O(3) model --- is popular in condensed matter physics, and in particle physics as a toy model for QCD. Along with other analogies, it shares with…