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Jan 13, 2017 at 8:34 comment added Andrey Feldman @Abhinav GR in 1+1 or 2D is trivial in the sense that $R_{\mu \nu}-\frac{1}{2} R g_{\mu \nu} \equiv 0$. In Euclidean signature the Einstein-Hilbert action is proportional to a topological quantity called Euler characteristics, so its infinitesimal variation is always zero.
Jan 12, 2017 at 20:20 comment added Abhinav usual GR is trivial in 2D. First, is this (2+1)-D or (1+1)-D? Second, what does the statement exactly mean?
Dec 21, 2016 at 20:05 history edited Andrey Feldman CC BY-SA 3.0
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Dec 21, 2016 at 7:59 history edited Andrey Feldman CC BY-SA 3.0
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Dec 21, 2016 at 7:51 history answered Andrey Feldman CC BY-SA 3.0