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On M-Theory Embedding of Topologically Massive Gravity
We show that topologically massive gravity can be obtained by the consistent
Kaluza-Klein reduction from recently constructed seven-dimensional gravity with
topological terms. The internal four-manifold should be Einstein with the
Pontryagin four-form constantly proportional to the volume form. We also
discuss the possible lift of the system to D=11. This enables us to connect the
mass parameter \tilde\mu in D=3 to the M5-brane charge. The dimensionless
quantity 3/(G\tilde \mu) is discrete and proportional to N, where N is the
number of M5-branes.Comment: 8 pages, no figures, references added, version appeared in
Int.J.Mod.Phys.
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