Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Metric-Independent Volume-Forms in Gravity and Cosmology   Employing alternative spacetime volume-forms (generally-covariant integration
measure densities) independent of the pertinent Riemannian spacetime metric
have profound impact in general relativity. Although formally appearing as
"pure-gauge" dynamical degrees of freedom they trigger a number of remarkable
physically important phenomena such as: (i) new mechanism of dynamical
generation of cosmological constant; (ii) new type of "quintessential
inflation" scenario in cosmology; (iii) non-singular initial "emergent
universe" phase of cosmological evolution preceding the inflationary phase;
(iv) new mechanism of dynamical spontaneous breakdown of supersymmetry in
supergravity; (v) gravitational electrovacuum "bags". We study in some detail
the properties, together with their canonical Hamiltonian formulation, of a
class of generalized gravity-matter models built with two independent
non-Riemannian volume-forms and discuss their implications in cosmology.

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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: astro-ph
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The categories of this paper are: q-alg
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The categories of this paper are: solv-int
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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: patt-sol
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The categories of this paper are: ao-sci
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The categories of this paper are: econ
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ex
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The categories of this paper are: funct-an
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The categories of this paper are: quant-ph