Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Non-Abelian Density Matrix Renormalization Group Algorithm   We describe here the extension of the density matrix renormalization group
algorithm to the case where Hamiltonian has a non-Abelian global symmetry
group. The block states transform as irreducible representations of the
non-Abelian group. Since the representations are multi-dimensional, a single
block state in the new representation corresponds to multiple states of the
original density matrix renormalization group basis. We demonstrate the
usefulness of the construction via the one-dimensional Hubbard model as the
symmetry group is enlarged from $U(1) \times U(1)$, up to $SU(2) \times SU(2)$.

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The categories of this paper are: eess
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The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: econ
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-bio
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The categories of this paper are: patt-sol
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The categories of this paper are: atom-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: stat
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The categories of this paper are: gr-qc
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-ph