41,541 research outputs found
Black hole state counting in loop quantum gravity
The two ways of counting microscopic states of black holes in the U(1)
formulation of loop quantum gravity, one counting all allowed spin network
labels j,m and the other only m labels, are discussed in some detail. The
constraints on m are clarified and the map between the flux quantum numbers and
m discussed. Configurations with |m|=j, which are sometimes sought after, are
shown to be important only when large areas are involved. The discussion is
extended to the SU(2) formulation.Comment: 5 page
Reply to comment by Zaslavskii on extremal black hole action
It is shown that Zaslavskii's misunderstanding of our published proof of the
irrelevance of all extremal black hole configurations (whether with equal
charge and mass or not) rests on his refusal to see the essential difference
between the correct inequality governing extremal and non-extremal actions and
his incorrect version.Comment: 1 page, REVTeX, adapted from reply in PRL 80, 3413 (1998
Absence of log correction in entropy of large black holes
Earlier calculations of black hole entropy in loop quantum gravity led to a
dominant term proportional to the area, but there was a correction involving
the logarithm of the area, the Chern-Simons level being assumed to be large. We
find that the calculations yield an entropy proportional to the area eigenvalue
with no such correction if the Chern-Simons level is finite, so that the area
eigenvalue can be relatively large.Comment: 8 page
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