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We report that a class of three-dimensional bimetric theories containasymptotically flat solutions. These spacetimes can be cast in a set ofasymptotic conditions at null infinity which are preserved under the infinitedimensional BMS group. Moreover, the algebra of the canonical generatorsexhibits a central extension. The possibility that these solutions describeregular black holes is also discussed.

Asymptotically flat spacetimes in 3D bigravity