No hair theorems for stationary axisymmetric black holes
  We present a non-perturbative proof of the no hair theorems corresponding to scalar and Proca fields for stationary axisymmetric de Sitter black hole spacetimes. Our method also applies to asymptotically flat and under a reasonable assumption, to asymptotically anti-de Sitter spacetimes. 
Sourav Bhattacharya and Amitabha Lahiri
gr-qc