24-30 July 2016
Highfield Campus, University of Southampton
Europe/London timezone

Domain decomposition and multilevel integration for fermions II

27 Jul 2016, 09:20
20m
Building 67 Room 1007 (Highfield Campus, University of Southampton)

Building 67 Room 1007

Highfield Campus, University of Southampton

Talk Algorithms and Machines Algorithms and Machines

Speaker

Marco Cè (Scuola Normale Superiore, Pisa, Italy & INFN, Sezione di Pisa, Italy)

Description

The numerical computation of many hadronic correlation functions is exceedingly difficult due to the exponentially decreasing signal-to-noise ratio with the distance between source and sink. Multilevel integration methods, using independent updates of separate regions in space-time, are known to be able to solve such problems but have so far been available only for pure gauge theory. We present first steps into the direction of making such integration schemes amenable to theories with fermions, by factorizing a given observable via an approximated domain decomposition of the quark propagator. This allows for multilevel integration of the (large) factorized contribution to the observable, while its (small) correction can be computed in the standard way.

Primary authors

Leonardo Giusti (Università di Milano-Bicocca & INFN, Sezione di Milano-Bicocca) Marco Cè (Scuola Normale Superiore, Pisa, Italy & INFN, Sezione di Pisa, Italy) Stefan Schaefer (NIC, DESY)

Presentation Materials