Speaker
Pietro Butti
(QTC, University of Southern Denmark)
Description
The signal-to-noise problem limits the reach of many lattice calculations. We present a variational framework that recasts it as a transport problem: the loss of signal reflects a mismatch between the distribution one samples and the one needed to measure an observable, and can be reduced by transporting configurations to close that gap.
The optimal transport is typically determined either through a stochastic estimator based on Langevin dynamics or by parametrising it as a normalising flow trained with automatic differentiation. We discuss how the framework brings these methods under a common variational principle and present results for scalar theories.
Authors
Dr
Alessandro Nada
(University of Turin)
Guilherme Catumba
(University Milano-Bicocca)
Louis Spatscheck
(University of Southern Denmark)
Pietro Butti
(QTC, University of Southern Denmark)