Speaker
Yoshiaki Koma
(Numazu College of Technology)
Description
We investigate the momentum dependence of the topological susceptibility and its derivative at zero momentum with overlap fermions.
We expose the role of the low-lying Dirac eigenmodes for the topological charge density, and find a negative value for the derivative. While the sign of the derivative is consistent with the QCD sum rule in pure Yang-Mills theory, the absolute value is estimated larger if only the contribution from the zero modes and of the low-lying eigenmodes is taken into account. We also examine the effect of dynamical quarks by a reweighting method and find that it reduces the topological susceptibility for smaller quark masses and triggers the change of sign of the derivative.
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Primary author
Yoshiaki Koma
(Numazu College of Technology)
Co-authors
Dr
Ernst-Michael Ilgenfritz
(Institut fuer Physik, Humboldt-Universitaet zu Berlin)
Dr
Gerrit Schierholz
(Deutsches Elektronen-Synchrotron DESY)
Dr
Karl Koller
(Fakultaet fuer Physik, Ludwig-Maximilians-Universitaet Muenchen)
Dr
Miho Koma
(Numazu College of Technology)
Dr
Thomas Streuer
(Institut fuer Theoretische Physik, Universitaet Regensburg)
Dr
Volker Weinberg
(Leibniz-Rechenzentrum der Bayerischen Akademie der Wissenschaften)
