Near-horizon extremal geometries: coadjoint orbits and quantization

  • R. Javadinezhad
  • B. Oblak
  • M. M. Sheikh-Jabbari
Open Access
Regular Article - Theoretical Physics


The NHEG algebra is an extension of Virasoro introduced in [arXiv:1503.07861]; it describes the symplectic symmetries of (n + 4)-dimensional Near Horizon Extremal Geometries with SL(2, ℝ) × U(1)n+ 1 isometry. In this work we construct the NHEG group and classify the (coadjoint) orbits of its action on phase space. As we show, the group consists of maps from an n-torus to the Virasoro group, so its orbits are bundles of standard Virasoro coadjoint orbits over T n. We also describe the unitary representations that are expected to follow from the quantization of these orbits, and display their characters. Along the way we show that the NHEG algebra can be built from u(1) currents using a twisted Sugawara construction.


Black Holes Conformal and W Symmetry Space-Time Symmetries AdSCFT Correspondence 


Open Access

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Copyright information

© The Author(s) 2018

Authors and Affiliations

  • R. Javadinezhad
    • 1
  • B. Oblak
    • 2
  • M. M. Sheikh-Jabbari
    • 3
  1. 1.Physics DepartmentNew York UniversityNew YorkU.S.A.
  2. 2.Institut für Theoretische Physik, ETH ZürichZürichSwitzerland
  3. 3.School of Physics, Institute for Research in Fundamental Sciences (IPM)TehranIran

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