In three‐dimensional pure gravity, there are no asymptotically flat black holes. However, once matter is present, richer geometries appear: it is the case for the Horne‐Horowitz black string and its generalisation. During this talk, I will present the first set of consistent boundary conditions which include the black string and leads to finite, integrable and conserved charges. The asymptotic symmetry algebra consists in a Witt algebra supplemented by three global u(1) charges. In the last part of the talk, I will discuss the thermodynamics of these solutions and point out some peculiar features of this system.
Céline Zwikel (TU Wien): Asymptotic symmetries of three‐dimensional black strings
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