Speaker
Mr
Jakob Simeth
(University of Regensburg)
Description
Disconnected contributions to hadronic quantities are noisy and still computationally challenging. Here, we explore the possibilities of Multigrid-based eigensolvers for Low-mode averaging and related methods.
Using only the few lowest approximate eigenmodes of the Hermitian Dirac operator $\gamma_5 M$ allows us to avoid expensive exact solves and improve the signal efficiently.
In this first test we apply the method to pion and eta correlators for $N_f=2$ Wilson-Clover fermions at several quark masses, down to $m_\pi = 150 MeV$ and volumes of up to $64^4$ sites.
Primary author
Mr
Jakob Simeth
(University of Regensburg)
Co-authors
Prof.
Andreas Frommer
(University of Wuppertal)
Prof.
Gunnar Bali
(University of Regensburg)
Dr
Issaku Kanamori
(National Chiao-Tung University, Taiwan)
Dr
Karsten Kahl
(University of Wuppertal)
Mr
Matthias Rottmann
(University of Wuppertal)
Dr
Sara Collins
(University of Regensburg)
