In connection with the long saga of the (claimed) microscopic calculations of th

Question

In connection with the long saga of the (claimed) microscopic calculations of the Hawking-Bekenstein entropy in (3+1) Loop Quantum Gravity (LQG) and related approaches I have the following question: Ignoring the question of the overall coefficient, what is the most clearly articulated argument that the entropy satisfies an area law in the first place?

For example, in A. Ashtekar, J. Baez, A. Corichi, K. Krasnov, http://arxiv.org/abs/gr-qc/9710007, I read

It is intuitively clear that not all the degrees of freedom described by fields ?A, ?? are relevant to the problem of black hole entropy. In particular, there are

Explanation / Answer

In Rovelli's book "Quantum Gravity", not only does he make that claim, he derives the area law straight from LQG. He also gives references for more detailed derivations. They are

gr-qc/0005126

"Modern Canonical Quantum Gravity" T. Thiemann- gr-qc/0110034

along with the reference you cited.

Also in Rovelli's book, in his Bibliographical notes for chapter 8 he gives a couple more different references for LQG and black holes. They are

K. Krasnov Phys. Rev. D55 (1997) 3505

K. Krasnov Gen. Rel. Grav. 30 (1998) 53-68 and gr-qc/9605047

K. Krasnov Gen. Rel. Grav. 30 (1998) 53

C. Rovelli Phys. Rev. Lett. 14 (1996) 3288

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