A perturbation analysis of the Bell-Szekeres space-time

Chandrasekhar, Subrahmanyan ; Xanthopoulos, Basilis C. (1988) A perturbation analysis of the Bell-Szekeres space-time Proceedings of the Royal Society A: Mathematical, Physical & Engineering Sciences, 420 (1858). pp. 93-123. ISSN 1364-5021

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Official URL: http://rspa.royalsocietypublishing.org/content/420...

Related URL: http://dx.doi.org/10.1098/rspa.1988.0119


Perturbation analysis of the Bell-Szekeres space-time is provided both in the region where the scattering of the colliding plane-fronted waves occurs (Region I) and in the regions prior to thc instant of collision (Regions II and III). A complete set of normal modes, expressed in terms of spin-weighted spherical harmonics and bounded in the entire Region I, is obtained. These modes exhibit a behaviour of ever-increasing frequency as the horizon (that develops as a result of the collision) is approached. Region II, bounded by the null lines, u=0(0≤v≤1) and v=l(u≤0) (where u and v define the directions of propagation of the colliding waves) does not allow u-independent perturbations to all orders; while all the u-dependent perturbations exhibit strong divergences along the entire line, v=l, u<0. This same description applies to Region III with the roles of u and v interchanged. These behaviours of the perturbations, in the regions of the space-time prior to the instant of collision, raise some serious conceptual questions.)

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