O. Sarbach et E. Winstanley, On the linear stability of solitons and hairy black holes with a negative cosmological constant: the odd-parity sector, CLASS QUANT, 18(11), 2001, pp. 2125-2146
Using a recently developed perturbation formalism based on curvature quanti
ties, we investigate the linear stability of black holes and solitons with
Yang-Mills hair and a negative cosmological constant. We show that those so
lutions which have no linear instabilities under odd- and even-parity spher
ically symmetric perturbations remain stable under odd-parity, linear, nons
pherically symmetric perturbations.