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)
