ÖPG-CMD Joint Meeting 2026

Kernels and Cycles in Real Time Complex Langevin

Sep 24, 2026, 11:15 AM

15m

HS 11.02 (University of Graz)

3) Contributed talk FAKT: Nuclear and Particle Physics Parallel

Speaker

Astrid Carstensen (University of Graz)

Description

Real time evolution in QFT poses a severe sign problem, which may be alleviated via a complex Langevin approach. However, simulation with large real-time extent give incorrect results. A kernel in a complex Langevin equation is known to influence the appearance of the boundary terms and integration cycles, and thus kernel choice can improve the range of real-time extents with correct results. For multi-dimensional models the optimal kernel is searched for using machine learning methods. We test this approach by simulating the simplest possible case, a 0+1-dimensional scalar field theory in Minkowski space.