Other
Scientific paper
May 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972phrvd...5.2439p&link_type=abstract
Physical Review D, vol. 5, Issue 10, pp. 2439-2454
Other
196
Scientific paper
A nearly spherical star collapses through its gravitational radius. Nonspherical perturbations exist in its density, pressure, electromagnetic field, and gravitational field, and in other (hypothetical) zero-rest-mass, integer-spin fields coupled to sources in the stars. Paper I analyzed the evolution of scalar-field and gravitational-field perturbations. This paper treats fields of arbitrary integer spin and zero rest mass, using the Newman-Penrose tetrad formalism. The analysis of each multipole (order=l) of each field (spin=s) is reduced to the study of a two-dimensional wave equation, with a "curvature potential" that differs little from one field to another. The analysis of this wave equation for the scalar case (s=0) carries over completely to fields of arbitrary spin s. In particular, any radiatable multipole (l>=s) gets radiated away completely in the late stages of collapse; if the multipole is static prior to the onset of collapse, it will die out as t-(2l+2) at late times. Nonradiatable multipoles (l
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