Low fermionic eigenmode dominance in QCD on the lattice
Neff
Hartmut
Neff, Hartmut
aut
2001-12-21
2001-12-11
2018-01-22
en
The utility of a spectral approximation to the quark propagator will
be demonstrated, using low-lying eigenmodes of the hermitian Wilson-Dirac
matrix, <i>Q</i> = γ<sub>5</sub><i> M</i>. The investigation is based on a total of 400
full QCD vacuum configurations, with two degenerate flavors of
dynamical Wilson fermions at β = 5 .6, at two different sea quark
masses. The spectral approach is successful in accessing both the
topological charge and disconnected diagrams, as they appear in the
η' correlation function. A suitable partial summation technique
is proposed that provides sufficient saturation for Tr <i>Q</i> <sup>-1</sup>, which is a
quantity directly related to the topological charge. In the effective
mass plot of the η' meson a consistent early plateau formation is
achieved, by ground state projecting the connected piece of the
propagator.
urn:nbn:de:hbz:468-20010685
2018-01-22T10:46:38.185Z
2018-01-22T12:01:32.039Z
published
Diss
fb08/diss2001/neff