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could someone give some examples :nonRiemannian manifold Alexandrov space with sec>=-1 and the first eigenvalue equal to (n-1)^2/4

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I'm not sure if I understand your question, but one might be able to take $\mathbb{H}^n$ modulo an appropriate finite group. It would help if you could give a reference for the definition of the eigenvalue for a non-Riemannian Alexandrov space. –  Ian Agol Jan 15 '13 at 18:21
    
"sharp spectral gap and Li-Yau's estimate on Alexandrov spaces" ,the first page you can see the definition –  jiangsaiyin Jan 16 '13 at 2:39
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