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Entropy 2011, 13(4), 744-777;

Static Isolated Horizons: SU(2) Invariant Phase Space, Quantization, and Black Hole Entropy

Centre de Physique Théorique, Université de Provence, Campus de Luminy, 13288, Marseille, France
Author to whom correspondence should be addressed.
Received: 22 February 2011 / Revised: 16 March 2011 / Accepted: 16 March 2011 / Published: 25 March 2011
(This article belongs to the Special Issue Black Hole Thermodynamics)
Full-Text   |   PDF [297 KB, uploaded 24 February 2015]


We study the classical field theoretical formulation of static generic isolated horizons in a manifestly SU(2) invariant formulation. We show that the usual classical description requires revision in the non-static case due to the breaking of diffeomorphism invariance at the horizon leading to the non-conservation of the usual pre-symplectic structure. We argue how this difficulty could be avoided by a simple enlargement of the field content at the horizon that restores diffeomorphism invariance. Restricting our attention to static isolated horizons we study the effective theories describing the boundary degrees of freedom. A quantization of the horizon degrees of freedom is proposed. By defining a statistical mechanical ensemble where only the area aH of the horizon is fixed macroscopically—states with fluctuations away from spherical symmetry are allowed—we show that it is possible to obtain agreement with the Hawkings area law (S = aH /(4l 2p)) without fixing the Immirzi parameter to any particular value: consistency with the area law only imposes a relationship between the Immirzi parameter and the level of the Chern-Simons theory involved in the effective description of the horizon degrees of freedom. View Full-Text
Keywords: quantum gravity; black hole entropy; isolated horizon quantum gravity; black hole entropy; isolated horizon
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Perez, A.; Pranzetti, D. Static Isolated Horizons: SU(2) Invariant Phase Space, Quantization, and Black Hole Entropy. Entropy 2011, 13, 744-777.

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