Abstract
The author proves the staticity and no-hair conjectures for self-gravitating nonlinear sigma -models with Riemannian target manifolds. The author first demonstrates that any self-coupled, stationary scalar mapping ( sigma -model) from a strictly stationary domain of outer communications with nonrotating horizon to a Riemannian manifold has to be static. Applying the positive mass theorem, the author subsequently shows that the exterior Schwarzschild geometry is the only maximally extended, static, asymptotically flat solution of the coupled Einstein- sigma -model equations with regular (but not necessarily connected) horizon.
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