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For simply connected pseudo-Riemannian space of constant curvature or a rank one Riemannian symmetric space (other than the octonion hyperbolic plane) the answer is yes, and can be found at http://arxiv.org/abs/0911.http://arxiv.org/abs/0911.2602
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For simply connected pseudo-Riemannian space of constant curvature or a rank one Riemannian symmetric space (other than the octonion hyperbolic plane) the answer is yes, and can be found at http://arxiv.org/abs/0911.