In computation of surface gravity for BTZ black hole, I cannot get the same result in literature, e.g. Eq(1.15) in gr-qc/9506079, even I cannot get the result of null surface, i.e. $\xi_a\xi^a=0$ for horizon Killing vector $\xi_a$(see Eq(1.13) in gr-qc/9506079). Could the results in gr-qc/9506079 be incorrect?
Stam Nicolis
The Killing vector in question is normal to the horizon, which is a null surface. It's not a null vector and the paper, of course, doesn't claim it is. It would be good to do the calculations described in the paper and not those that aren't.
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