Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Density matrix renormalization group approach of the spin-boson model   We propose a density matrix renormalization group approach to tackle a
two-state system coupled to a bosonic bath with continuous spectrum. In this
approach, the optimized phonon scheme is applied to several hundred phonon
modes which are divided linearly among the spectrum. Although DMRG cannot
resolve very small energy scales, the delocalized-localized transition points
of the two-state system are extracted by the extrapolation of the flow diagram
results. The phase diagram is compared with the numerical renormalization group
results and shows good agreement in both Ohmic and sub-Ohmic cases.

35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con