Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Accelerated Overlap Fermions   Numerical evaluation of the overlap Dirac operator is difficult since it
contains the sign function $\epsilon(H_w)$ of the Hermitian Wilson-Dirac
operator $H_w$ with a negative mass term. The problems are due to $H_w$ having
very small eigenvalues on the equilibrium background configurations generated
in current day Monte Carlo simulations. Since these are a consequence of the
lattice discretisation 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 two speedup by moving from the
  Wilson action to a FLIC (Fat Link Irrelevant Clover) action as the overlap
kernel.

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The categories of this paper are: hep-th
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The categories of this paper are: hep-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
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The categories of this paper are: supr-con
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The categories of this paper are: cs
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
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The categories of this paper are: comp-gas
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The categories of this paper are: astro-ph
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The categories of this paper are: funct-an
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The categories of this paper are: physics
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-ex