Luis J Garay and Guillermo A Mena Marugán 2003 Class. Quantum Grav. 20 L115 doi:10.1088/0264-9381/20/8/103
Luis J Garay and Guillermo A Mena Marugán
Show affiliationsWe analyse changes of the Immirzi parameter in loop quantum gravity and compare their consequences with those of Lorentz boosts and constant conformal transformations in black-hole physics. We show that the effective value deduced for the Planck length in local measurements of vacuum black holes by an asymptotic observer may depend on its conformal or Lorentz frame. This introduces an apparent ambiguity in the expression of the black-hole entropy which is analogous to that produced by the Immirzi parameter. For quantities involving a notion of energy, the similarity between the implications of the Immirzi ambiguity and a conformal scaling disappears, but the parallelism with boosts is maintained.
04.70.Dy Quantum aspects of black holes, evaporation, thermodynamics
Issue 8 (21 April 2003)
Received 10 December 2002
Published 28 March 2003
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