Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Does a Nambu-Goto wall emit gravitational waves? -- Cylindrical
  Nambu-Goto wall as an example of gravitating non-spherical walls --   Gravitational field of a cylindrical Nambu-Goto wall in the vacuum spacetime
is considered in order to clarify the interaction between Nambu-Goto membranes
and gravitational waves. If one neglects the emission of gravitational waves by
the wall motion, the spacetime becomes singular. It is also shown that the
emission of gravitational waves does occur by the motion of the cylindrical
wall if the initial data is singularity free. The energy loss rate due to
radiation of gravitational waves agrees with that estimated from the test wall
motion and the quadrupole formula for the gravitational wave emission. This is
quite different from the oscillatory behavior of gravitating Nambu-Goto
membranes: the presence of gravity induces the wall to lose its dynamical
degree of freedom.

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The categories of this paper are: quant-ph
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The categories of this paper are: q-bio
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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: nucl-th
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The categories of this paper are: adap-org
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The categories of this paper are: math-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ph
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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: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: physics