Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A 2-Surface Quantization of the Lorentzian Gravity   This is a contribution to the MG9 session QG1-a. A new quantum representation
for the Lorentzian gravity is created from the Pullin vaccum by the operators
assigned to 2-complexes. The representation uses the original, spinorial
Ashtekar variables, the reality conditions are well posed and Thiemann's
Hamiltonian is well defined. The results on the existence of a suitable Hilbert
product are partial. They were derived in collaboration with Abhay Ashtekar.

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The categories of this paper are: q-bio
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
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The categories of this paper are: cond-mat
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The categories of this paper are: stat
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: supr-con
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The categories of this paper are: q-fin
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The categories of this paper are: funct-an
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: solv-int
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The categories of this paper are: atom-ph