Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Real Tunneling Solutions and the Hartle-Hawking Wave Function   A real tunneling solution is an instanton for the Hartle-Hawking path
integral with vanishing extrinsic curvature (vanishing ``momentum'') at the
boundary. Since the final momentum is fixed, its conjugate cannot be specified
freely; consequently, such an instanton will contribute to the wave function at
only one or a few isolated spatial geometries. I show that these geometries are
the extrema of the Hartle-Hawking wave function in the semiclassical
approximation, and provide some evidence that with a suitable choice of time
parameter, these extrema are the maxima of the wave function at a fixed time.

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The categories of this paper are: chao-dyn
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The categories of this paper are: alg-geom
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
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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: cond-mat
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The categories of this paper are: quant-ph
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The categories of this paper are: q-alg
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The categories of this paper are: funct-an
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The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-ex