Articles written in Pramana – Journal of Physics
Volume 69 Issue 1 July 2007 pp 109-118
Horizons in $2+1$-dimensional collapse of particles
Dieter Brill Puneet Khetarpal Vijay Kaul
A simple, geometrical construction is given for three-dimensional spacetimes with negative cosmological constant that contain two particles colliding head-on. Depending on parameters like particle masses and distance, the combined geometry will be that of a particle, or of a black hole. In the black hole case the horizon is calculated. It is found that the horizon typically starts at a point and spreads into a closed curve with corners, which propagate along spacelike caustics and disappear as the horizon passes the particles.
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