A Radiation Scalar for Numerical Relativity

Details A Radiation Scalar for Numerical Relativity A Radiation Scalar for Numerical Relativity

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..4cf.aa005b&link_type=abstract

American Physical Society, Four Corners Meeting 2002, October 4-5, 2002 University of Utah, Salt Lake City, Utah, MEETING ID: 4C

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The notion of gravitational radiation is only physically well-defined in regions of space-time with certain special features. Even in such regions, however, one must discriminate between physical radiation and oscillations in the field variables arising from a particular choice of coordinates. We discuss a scalar quantity constructed locally from space-time geometry which is designed to address these issues. It is invariant under a change of coordinates and depends only on the ``radiative'' part , and not the ``Coulombic'' part, of the gravitational field in regions where the two can be distinguished. We highlight applications to computer simulations of astrophysical systems.

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