Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Covariant techniques in Quantum Field Theory   In this paper some techniques useful to perform quantum field theory
computations in a covariant manner are reviewed. In particular the background
field gauge, the zeta function regularization and the heat kernel approach are
highlighted. Some detailed calculations of the Schwinger-de Witt coefficients
of the small proper time expansion of the heat kernel are also repeated in
detail. This work reports lectures given by Enrique \'Alvarez at the
IFT-UAM-CSIC in Madrid.

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The categories of this paper are: q-bio
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The categories of this paper are: hep-lat
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The categories of this paper are: stat
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The categories of this paper are: dg-ga
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The categories of this paper are: mtrl-th
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The categories of this paper are: solv-int
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The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: gr-qc
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The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
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The categories of this paper are: math-ph
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The categories of this paper are: comp-gas