Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
1993-12-15
Phys.Rev. D49 (1994) 6587-6598
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
23 pages, latex, McGill/93--22 (typos in sect. 3 corrected)
Scientific paper
10.1103/PhysRevD.49.6587
Two techniques for computing black hole entropy in generally covariant gravity theories including arbitrary higher derivative interactions are studied. The techniques are Wald's Noether charge approach introduced recently, and a field redefinition method developed in this paper. Wald's results are extended by establishing that his local geometric expression for the black hole entropy gives the same result when evaluated on an arbitrary cross-section of a Killing horizon (rather than just the bifurcation surface). Further, we show that his expression for the entropy is not affected by ambiguities which arise in the Noether construction. Using the Noether charge expression, the entropy is evaluated explicitly for black holes in a wide class of generally covariant theories. Further, it is shown that the Killing horizon and surface gravity of a stationary black hole metric are invariant under field redefinitions of the metric of the form $\bar{g}_{ab}\equiv g_{ab} + \Delta_{ab}$, where $\Delta_{ab}$ is a tensor field constructed out of stationary fields. Using this result, a technique is developed for evaluating the black hole entropy in a given theory in terms of that of another theory related by field redefinitions. Remarkably, it is established that certain perturbative, first order, results obtained with this method are in fact {\it exact}. The possible significance of these results for the problem of finding the statistical origin of black hole entropy is discussed.}
Jacobson Ted
Kang Gungwon
Myers Robert C.
No associations
LandOfFree
On Black Hole Entropy does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with On Black Hole Entropy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On Black Hole Entropy will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-356790