no code implementations • 2 Mar 2022 • Jan M. Pawlowski, Julian M. Urban

In this proof-of-principle study, we demonstrate our method in the context of two-component scalar field theory where the $O(2)$ symmetry is explicitly broken by an imaginary external field.

no code implementations • 26 Feb 2021 • Jean-Paul Blaizot, Jan M. Pawlowski, Urko Reinosa

In particular, we exploit the exact 2PI relations between the two-point and four-point functions in order to truncate the infinite hierarchy of equations of the functional renormalization group.

High Energy Physics - Theory Other Condensed Matter Strongly Correlated Electrons High Energy Physics - Phenomenology

no code implementations • 25 Feb 2021 • Fei Gao, Joannis Papavassiliou, Jan M. Pawlowski

The components of the quark propagator obtained from our approach are in excellent agreement with the results from Schwinger-Dyson equations, the functional renormalisation group, and lattice QCD simulation, a simple benchmark observable being the chiral condensate in the chiral limit, which is computed as $(245\,\textrm{MeV})^3$.

High Energy Physics - Phenomenology High Energy Physics - Lattice High Energy Physics - Theory Nuclear Theory

1 code implementation • 2 Feb 2021 • Jan M. Pawlowski, Coralie S. Schneider, Nicolas Wink

We present the Mathematica package QMeS-Derivation.

High Energy Physics - Phenomenology High Energy Physics - Theory Computational Physics

no code implementations • 2 Feb 2021 • Eduardo Grossi, Friederike J. Ihssen, Jan M. Pawlowski, Nicolas Wink

We discuss the phase structure of the two-flavour quark-meson model including quantum, thermal, density and critical fluctuations with the functional renormalisation group.

High Energy Physics - Phenomenology High Energy Physics - Theory

no code implementations • 11 Jan 2021 • Jan M. Pawlowski, Manuel Scherzer, Christian Schmidt, Felix P. G. Ziegler, Felix Ziesché

We discuss the structure of Generalized Lefschetz thimbles for pure Yang-Mills theories with a complex gauge coupling $\beta$ and show how to incorporate the gauge orbits.

High Energy Physics - Lattice High Energy Physics - Phenomenology

no code implementations • 3 Aug 2020 • Stefanie Czischek, Andreas Baumbach, Sebastian Billaudelle, Benjamin Cramer, Lukas Kades, Jan M. Pawlowski, Markus K. Oberthaler, Johannes Schemmel, Mihai A. Petrovici, Thomas Gasenzer, Martin Gärttner

The approximation of quantum states with artificial neural networks has gained a lot of attention during the last years.

no code implementations • 3 Mar 2020 • Stefan Bluecher, Lukas Kades, Jan M. Pawlowski, Nils Strodthoff, Julian M. Urban

Machine learning has the potential to aid our understanding of phase structures in lattice quantum field theories through the statistical analysis of Monte Carlo samples.

no code implementations • 10 May 2019 • Lukas Kades, Jan M. Pawlowski, Alexander Rothkopf, Manuel Scherzer, Julian M. Urban, Sebastian J. Wetzel, Nicolas Wink, Felix P. G. Ziegler

We explore artificial neural networks as a tool for the reconstruction of spectral functions from imaginary time Green's functions, a classic ill-conditioned inverse problem.

no code implementations • 16 Jan 2019 • Lukas Kades, Jan M. Pawlowski

A formulation of Langevin dynamics for discrete systems is derived as a class of generic stochastic processes.

1 code implementation • 8 Nov 2018 • Julian M. Urban, Jan M. Pawlowski

Short autocorrelation times are essential for a reliable error assessment in Monte Carlo simulations of lattice systems.

High Energy Physics - Lattice Computational Physics

1 code implementation • 17 May 2017 • Jan M. Pawlowski, Ion-Olimpiu Stamatescu, Felix P. G. Ziegler

We show, that UV modes can be removed systematically without altering the physics content of the theory.

High Energy Physics - Lattice High Energy Physics - Phenomenology High Energy Physics - Theory

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