Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Domain decomposition, multi-level integration and exponential noise
  reduction in lattice QCD   We explore the possibility of computing fermionic correlators on the lattice
by combining a domain decomposition with a multi-level integration scheme. The
quark propagator is expanded in series of terms with a well defined
hierarchical structure. The higher the order of a term, the (exponentially)
smaller its magnitude, the less local is its dependence on the gauge field.
Once inserted in a Wick contraction, the gauge-field dependence of the terms in
the resulting series can be factorized so that it is suitable for multi-level
Monte Carlo integration. We test the strategy in quenched QCD by computing the
disconnected correlator of two flavor-diagonal pseudoscalar densities, and a
nucleon two-point function. In either cases we observe a significant
exponential increase of the signal-to-noise ratio.

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The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: quant-ph
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The categories of this paper are: q-fin
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The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org
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The categories of this paper are: patt-sol
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The categories of this paper are: funct-an
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The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph