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A C-metric type solution for general relativity with cosmological constant ispresented in 2+1 dimensions. It is interpreted as a three-dimensional blackhole accelerated by a strut. Positive values of the cosmological constant areadmissible too. Some embeddings of this metric in the 3+1 space-time areconsidered: accelerating BTZ black string and a black ring where thegravitational force is sustained by the acceleration.

Accelerating black hole in 2+1 dimensions and 3+1 black (st)ring