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Paper   IPM / P / 15111
School of Physics
  Title:   Near-horizon geometry and warped conformal symmetry
1.  H.R. Afshar
2.  S. Detournay
3.  D. Grumiller
4.  B. Oblak
  Status:   Published
  Journal: JHEP
  Vol.:  03
  Year:  2016
  Pages:   187
  Supported by:  IPM
We provide boundary conditions for three-dimensional gravity including boosted Rindler spacetimes, representing the near-horizon geometry of non-extremal 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 zero-mode solutions. We confirm this match in a generalization to boosted Rindler-AdS. Finally, we show how Rindler entropy emerges in a suitable limit.

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