Speaker
Description
Previous work has shown that renormalization group blocking of a
2+1 flavor DWF ensemble with 1/a = 2 GeV can produce an ensemble
with 1/a = 1 GeV, with physical quantities on the blocked 1 GeV
ensemble within a few percent of their values on an independently
generated 1 GeV ensemble. This has led us to investigate using the
blocked ensemble DWF operator as a coarse-grid operator for a
multigrid DWF solver. We find that the low-mode space of the
coarse-grid operator spans the low-mode space of the original
operator quite well. However, in the simplest coarse-grid to
fine-grid interpolation step, fine-grid high modes are introduced
into a low-mode-accurate, coarse-grid solution. We have studied
various filtering schemes to reduce this contamination, with partial
success to date. We will review our overall approach and detail
our current status.
