http://arxiv.org/PS_cache/arxiv/pdf/0811/0811.2161v1.pdf [Broken](adsbygoogle = window.adsbygoogle || []).push({});

He finds that only twists and knots are conserved in ribbon networks, that is, generalized spin networks. He finds that there is an infinite number of redundant states.

He suggests in the end that one might try this.

http://arxiv.org/PS_cache/gr-qc/pdf/0510/0510052v1.pdf

or this:

"The only alternative to this is that we should reduce the physical Hilbert space of atheory of quantum gravity to require that there do not exist any knots or crossings."

And in the next statement, it seems he will follow the first options, since the second means giving up everything he did on PI.

"Our ability to consider this super selection rule and still do certain things (integrate over all

topologies, consider embedded spin networks) is questionable and requires investigation

before this can be adopted as an ‘easy’ solution.

I'd like to listen to your opinions.

But, anyway, if one wants to follow Yi DunWan, one must consider http://arxiv.org/PS_cache/gr-qc/pdf/0510/0510052v1.pdf

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# Infinite Degeneracy of States in Quantum Gravity

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