Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/11133
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Type: | Journal article |
Title: | Accelerated overlap fermions |
Author: | Kamleh, W. Adams, D. Leinweber, D. Williams, A. |
Citation: | Physical Review D: Particles, Fields, Gravitation and Cosmology, 2002; 66(1):014501-1-014501-9 |
Publisher: | American Physical Soc |
Issue Date: | 2002 |
ISSN: | 1550-7998 0556-2821 |
Organisation: | Special Research Centre for the Subatomic Structure of Matter |
Statement of Responsibility: | Waseem Kamleh, David H. Adams, Derek B. Leinweber, and Anthony G. Williams |
Abstract: | Numerical evaluation of the overlap Dirac operator is difficult since it contains the sign function ε(Hw) of the Hermitian Wilson-Dirac operator Hw with a negative mass term. The problems are due to Hw having very small eigenvalues on the equilibrium background configurations generated in current day Monte Carlo simulations. Since these are a consequence of the lattice discretization and do not occur in the continuum version of the operator, we investigate in this paper to what extent the numerical evaluation of the overlap can be accelerated by making the Wilson-Dirac operator more continuum-like. Specifically, we study the effect of including the clover term in the Wilson-Dirac operator and smearing the link variables in the irrelevant terms. In doing so, we have obtained a factor of 2 speedup by moving from the Wilson action to a fat link irrelevant clover action as the overlap kernel. |
Rights: | © 2002 American Physical Society |
DOI: | 10.1103/PhysRevD.66.014501 |
Published version: | http://dx.doi.org/10.1103/physrevd.66.014501 |
Appears in Collections: | Aurora harvest 2 Special Research Centre for the Subatomic Structure of Matter publications |
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hdl_11133.pdf | Published version | 169.2 kB | Adobe PDF | View/Open |
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