Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quasilocal Center-of-Mass   Gravitating systems have no well-defined local energy-momentum density.
Various quasilocal proposals have been made, however the center-of-mass moment
(COM) has generally been overlooked. Asymptotically flat graviating systems
have 10 total conserved quantities associated with the Poincar{\'e} symmetry at
infinity. In addition to energy-momentum and angular momentum (associated with
translations and rotations) there is the boost quantity: the COM. A complete
quasilocal formulation should include this quantity. Getting good values for
the COM is a fairly strict requirement, imposing the most restrictive fall off
conditions on the variables. We take a covariant Hamiltonian approach,
associating Hamiltonian boundary terms with quasilocal quantities and boundary
conditions. Unlike several others, our {\it covariant symplectic} quasilocal
expressions do have the proper asymptotic form for all 10 quantities.

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The categories of this paper are: ao-sci
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The categories of this paper are: physics
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The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: chem-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: supr-con
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: math-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: eess
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The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys