(adsbygoogle = window.adsbygoogle || []).push({}); Jacobson renovates LQG with a roto-Reuter

I think the word for it isRENOVATION

A roto-rooter^{TM}is a tool for clearing clogged drains.

I've been watching Martin Reuter papers since 2004, especially since a possible link with Loll's CDT appeared in 2005, but with reserve. I found Reuter's talk at Loops '07 very persuasive and gave me confidence in what he is doing.

After Loops '07 a central question seemed to be how asymptotic safety, non-perturbative renormalizability, the running of newton G and Lambda---how these things will affect LQG and other non-string QG approaches.

What Reuter has put on the table can actually bring about a revolution in LQG. Maybe resolve the quandary about the Hamiltonian constraint. In any case bring new results and energy into the field.

In my humble view, it's time to see how Reutering will impact various features of LQG. even ones long taken for granted.

Jacobson brought out a 7-page paper today and it looks to me as if he is going right to work on this.

http://arxiv.org/abs/0707.4026

Renormalization and black hole entropy in Loop Quantum Gravity

Ted Jacobson

7 pages

(Submitted on 26 Jul 2007)

"Microscopic state counting for a black hole in Loop Quantum Gravity yields a result proportional to horizon area, and inversely proportional to Newton's constant and the Immirzi parameter. It is argued here that before this result can be compared to the Bekenstein-Hawking entropy of a macroscopic black hole, the scale dependence of both Newton's constant and the area must be accounted for. The two entropies could then agree for any value of the Immirzi parameter, if a certain renormalization property holds."

Jacobson's reference [15] is a Martin Reuter paper

[15] M. Reuter and J. M. Schwindt, “Scale-dependent metric and causal

structures in quantum Einstein gravity,” JHEP 0701, 049 (2007)

[arXiv:hep-th/0611294].

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# Jacobson renews LQG with a roto-Reuter

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