Roh-Suan Tung used to be at University of Chicago, and at Uni Lancaster in the UK and at Taiwan Central University. Now he is at University of Shanghai. He has co-authored with Ted Jacobson. Eventually Loop Quantum Gravity could get securely established in Chinese People's Republic. It might look like this. http://www.arxiv.org/abs/gr-qc/0509028 Origin of the Immirzi Parameter Chung-Hsien Chou, Roh-Suan Tung, Hoi-Lai Yu "Using quadratic spinor techniques we demonstrate that the Immirzi parameter can be expressed as ratio between scalar and pseudo-scalar contributions in the theory and can be interpreted as a measure of how Einstein gravity differs from a generally constructed covariant theory for gravity. This interpretation is independent of how gravity is quantized. One of the important advantage of deriving the Immirzi parameter using the quadratic spinor techniques is to allow the introduction of renormalization scale associated with the Immirzi parameter through the expectation value of the spinor field upon quantization." Tung et al cite two very interesting papers, one by Freidel et al and one by Perez and Rovelli  A. Perez and C. Rovelli, “Physical effects of the Immirzi parameter”, http://arxiv.org/gr-qc/0505081 [Broken].  L. Freidel, D. Minic and T. Takeuchi, “Quantum gravity, torsion, parity violation and all that" http://arxiv.org/hep-th/0507253 [Broken]. If I was trying to be funny I would say something about outsourcing. like "outsourcing the immirzi parameter". Incredible as it sounds, there is now even a service in Shanghai where american highschool kids can log on and get help with their physics and math homework. A lot of the brainwork is being shipped out these days. But anyway this is not funny. References  and  are two very recent and (in my humble) very smart papers to follow up on. And these people have followed up on the Freidel within two months. Next time I visit the Loops 05 website I will see if Roh-Suan is planning to attend.