Abstract
We present an analytical solution of a massless scalar field collapsing in a three-dimensional space-time with a negative cosmological constant, i.e. asymptotically AdS3. The Einstein and scalar field equations are formulated using double-null Poincaré coordinates. Trapping horizons form when a critical parameter is p > 1. There are indications that the horizon radius rAH scales like and the black hole mass as , i.e. with a critical mass exponent of 1/2.
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