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We construct hairy rotating black hole solutions in three dimensionalEinstein gravity coupled to a complex scalar field. When we turn on a real anduniform source on the dual CFT, the black hole is stationary with two Killingvectors and we show that there is no inner horizon for the black hole and thesystem evolves smoothly into a Kasner universe. When we turn on a complex andperiodic driving source on the dual CFT with a phase velocity equal to theangular velocity of the black hole, we have a time-dependent black hole withonly one Killing vector. We show that inside the black hole, after a rapidcollapse of the Einstein-Rosen bridge, oscillations of the scalar field follow.Then the system evolves into the Kasner epoch with possible Kasner inversion,which occurs in most of the parameter regimes. In both cases, one of the metricfields obeys a simple relation between its value at the horizon and in theKasner epoch.

Internal structure of hairy rotating black holes in three dimensions