Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Calculation of the quark condensate through Schwinger-Dyson equation   In this letter, we clarify the algebra expression for calculating the quark
condensate based on the non-perturbative quark propagator calculated through
Schwinger-Dyson equation. The quark condensates, which characterize the low
energy QCD vacuum, should not get a divergent quantity at large energy scale;
the re-normalization group evolution behaviour at large energy scale therefore
should be interpreted as "smeared collective effects" for it contains both
perturbative and non-perturbative parts.
  We prefer the integral expression and get a quantity which is both convergent
and scale dependent.

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The categories of this paper are: eess
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The categories of this paper are: quant-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga
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The categories of this paper are: math-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: acc-phys
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ex
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The categories of this paper are: cond-mat
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-ex
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The categories of this paper are: stat