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Paper IPM / P / 15111  


Abstract:  
We provide boundary conditions for threedimensional gravity including boosted Rindler spacetimes, representing the nearhorizon geometry of nonextremal black holes or flat space cosmologies. These boundary conditions force us to make some unusual choices, like integrating the canonical boundary currents over retarded time and periodically identifying the latter. The asymptotic symmetry algebra turns out to be a Witt algebra plus a twisted u(1) current algebra with vanishing level, corresponding to a twisted warped CFT that is qualitatively different from the ones studied so far in the literature. We show that this symmetry algebra is related to BMS by a twisted Sugawara construction and exhibit relevant features of our theory, including matching micro and macroscopic calculations of the entropy of zeromode solutions. We confirm this match in a generalization to boosted RindlerAdS. Finally, we show how Rindler entropy emerges in a suitable limit.
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