Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The density matrix renormalisation group and critical phenomena   We adapt White's density matrix renormalisation group (DMRG) to the direct
study of critical phenomena. We use the DMRG to generate transformations in the
space of coupling constants. We postulate that a study of density matrix
eigenvalues leads to a natural identification of renormalised blocks, operators
and Hamiltonians. We apply the scheme to the phase transition in the
anisotropic spin-1/2 Heisenberg chain. In the simplest case where the two most
probable states in odd sized blocks are used to construct approximate
renormalisation group transformations, we find qualitative improvement upon the
standard real space renormalisation group method for the thermal exponent
$\nu$.

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The categories of this paper are: supr-con
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn
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The categories of this paper are: math-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin
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The categories of this paper are: acc-phys
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The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: nlin
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The categories of this paper are: hep-ph
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The categories of this paper are: cs
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The categories of this paper are: q-bio