Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Immirzi parameter in the Barrett-Crane model?   We study the generalised constrained BF theory described in gr-qc/0102073 in
order to introduce the Immirzi parameter in spin foam models. We show that the
resulting spin foam model is still based on simple representations and that the
generalised BF action is simply a deformation of the Barrett-Crane model. The
Immirzi parameter doesn't change the representations used in the spin foam
model, so it doesn't affect the geometry of the model. However we show how it
may still appear as a factor in the area spectrum.

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The categories of this paper are: nlin
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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
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The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: patt-sol
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The categories of this paper are: q-bio
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The categories of this paper are: stat
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The categories of this paper are: hep-lat
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The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: physics
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The categories of this paper are: hep-ph