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12.02.2024 / 13:15 - 14:15 / Zeuthen, 1.207 IRIS | Zum Großen Windkanal 2, 12489 Berlin
Lattice SeminarMitigating topological freezing with out-of-equilibrium simulations (12/12)
Alessandro Nada (University of Turin)
Calculations of topological observables in lattice gauge theories with traditional Monte Carlo algorithms have long been known to be a difficult task, due to long autocorrelations times. Several mitigation strategies have been put forward, including the use of open boundary conditions and methods such as parallel tempering. In this talk we discuss a new approach based on out-of-equilibrium Monte Carlo simulations in which, starting from thermalized configurations with open boundary conditions on a line defect, periodic boundary conditions are gradually switched on. A sampling of topological observables is then shown to be possible with a specific technique inspired by Jarzynski's equality. We discuss the efficiency of this approach using results for the 2-dimensional CP^{N-1} model. Finally, we lay the grounds for an implementation of this algorithm in the context of Stochastic Normalizing Flows, in which the non-equilibrium evolutions are generalized with the use of deep neural networks.
More Information: https://indico.desy.de/category/873/
