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Oct28-10, 08:32 AM
Sci Advisor
P: 8,802
They think it's the complex conjugate terms in Eq 9 and 10 which is bad. I think Bianch et al tried to fix this.

But the new spin foams have a divergent physical inner product, so that's another problem. Group field theory renormalization?

But if the theory is renormalized, how can it have a fundamental scale of discreteness?