Robert Bartnik 1997 Class. Quantum Grav. 14 2185 doi:10.1088/0264-9381/14/8/017
Robert Bartnik
Show affiliationsProperties of the Einstein equations in a coordinate gauge based on expanding null hypersurfaces foliated by metric 2-spheres are described. This null quasispherical (NQS) gauge leads to particularly simple analyses of the characteristic structure of the equations and of the propagation of gravitational shocks, and clarifies the geometry of timelike boundary condition. A feature of the NQS gauge is the use of the standard
(`edth') operator on
to express angular derivatives, and the consequent use of spin-weighted spherical harmonic decompositions of the metric fields.
83C05 Einstein's equations (general structure, canonical formalism, Cauchy problems)
Issue 8 (August 1997)
Received 24 December 1996, in final form 19 May 1997
Robert Bartnik 1997 Class. Quantum Grav. 14 2185
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