Proceedings of the Particle Physics and Early Universe Conference (PPEUC).
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2 The collapsing shell 

In a two-dimensional space-time we define:

conformal global coordinates; .

time and distance to an origin ().

Localised massless collapsing shell (, ):


Boundary conditions for :

Problem calculate for :




where is a constant (Vendrell (1997a)) (The solution depends actually on the representation of the delta function (eq.3), which is defined here by , where the function is continuous except possibly at .) The functions and are left undetermined for , contrary to the 4-D case (Synge (1957)).

PPEUC Proceedings
Thu Jun 19 16:06:54 BST 1997