# Comparison of the Noether charge and Euclidean methods for computing the entropy of stationary black holes.

@article{Iyer1995ComparisonOT, title={Comparison of the Noether charge and Euclidean methods for computing the entropy of stationary black holes.}, author={Iyer and Wald}, journal={Physical review. D, Particles and fields}, year={1995}, volume={52 8}, pages={ 4430-4439 } }

The entropy of stationary black holes has recently been calculated by a number of different approaches. Here we compare the Noether charge approach (defined for any diffeomorphism invariant Lagrangian theory) with various Euclidean methods, specifically, (i) the microcanonical ensemble approach of Brown and York, (ii) the closely related approach of Ba\~nados, Teitelboim, and Zanelli which ultimately expresses black hole entropy in terms of the Hilbert action surface term, (iii) another formula…

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