The asymptotic symmetries of the near-horizon geometry of a lifted (near-extremal) Reissner-Nordstrom black hole, obtained by inverting the Kaluza-Klein reduction, explain the deviation of the Bekenstein-Hawking entropy from extremality. We point out the fact that the extra dimension allows us to justify the use of a Virasoro mode decomposition along the time-like boundary of the near-horizon geometry, AdS2×Sn, of the lower-dimensional (Reissner-Nordstrom) spacetime.
Izquierdo, J.M. Navarro Salas, José Navarro, P. 2002 Kaluza-Klein theory, AdS/CFT correspondence and black hole entropy Classical and Quantum Gravity 19 3 563 570
