Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Jordan-Brans-Dicke Quantum Wormholes and Coleman's Mechanism   We consider the quantum gravity and cosmology of a Jordan-Brans-Dicke theory,
predicted by string effective actions. We study its canonical formalism and
find that the constraint algebra is that of general relativity, as a
consequence of the general covariance of scalar-tensor theories. We also
analyze the problem of boundary conditions and propose that they must be
imposed in the Jordan frame, in which particles satisfy the strong equivalence
principle. Specifically, we discuss both Hartle-Hawking and wormhole boundary
conditions in the context of quantum cosmology. We find quantum wormhole
solutions for Jordan-Brans-Dicke gravity even in the absence of matter.
Wormholes may affect the constants of nature and, in particular, the
Brans-Dicke parameter. Following Coleman's mechanism, we find a probability
distribution which is strongly peaked at zero cosmological constant and
infinite Brans-Dicke parameter. That is, we recover general relativity as the
effective low energy theory of gravity.

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The categories of this paper are: q-bio
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The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
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The categories of this paper are: atom-ph
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The categories of this paper are: eess
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The categories of this paper are: stat
37
The categories of this paper are: supr-con
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
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The categories of this paper are: adap-org
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The categories of this paper are: solv-int
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th