GRAVITATING SIGMA-MODEL SOLITONS - ART. NO. 105013

We study the axially symmetric static solitons of the O(3) nonlinear s igma model coupled to (2 + 1)-dimensional anti-de Sitter gravity. The obtained solutions are not self-dual under a static metric. The usual regular topological lump solution cannot form a black hole even though the scale of symmetry breaking is increased. There exist nontopologic al solitons of half integral winding in a given model, and the corresp onding spacetimes involve charged Banados-Teitelboim-Zanelli black hol es without non-Abelian scalar hair. [S0556-2821(98)02420-5].