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How serious a problem is this for LQG? Does this mean that LQG doesn't have GR as its semiclassical limit? Does that mean it's a dead theory, or maybe just that it needs to be modified? Is the technique using Euclidean gravity reliable?...we apply Euclidean gravity to compute logarithmic corrections to the entropy of various non-extremal black holes in different dimensions [...] For Schwarzschild black holes in four space-time dimensions the macroscopic result seems to disagree with the existing result in loop quantum gravity.

Since I'm not a specialist, I'd be interested in a hand-wavy explanation of what the Euclidean gravity technique is about.

Sen, http://arxiv.org/abs/arXiv:1205.0971

[cross-posted from http://physics.stackexchange.com/questions/69656/significance-for-lqg-of-sens-result-on-entropy-of-black-holes ]