Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Local Hamiltonian for Spherically Symmetric Collapse: Geometrodynamics
  Approach   Recently a {\it local} true (completely gauge fixed) Hamiltonian for
spherically symmetric collapse was derived in terms of Ashtekar variables. We
show that such a local Hamiltonian follows directly from the geometrodynamics
of gravity theories that obey a Birkhoff theorem and possess a mass function
that is constant on the constraint surface in vacuum. In addition to clarifying
the geometrical content, our approach has the advantage that it can be directly
applied to a large class of spherically symmetric and 2D gravity theories,
including $p$-th order Lovelock gravity in D dimensions. The resulting
expression for the true local Hamiltonian is universal and remarkably simple in
form.

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The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
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The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
18
The categories of this paper are: econ
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The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs