Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Renormalization of Hamiltonians   A matrix model of an asymptotically free theory with a bound state is solved
using a perturbative similarity renormalization group for hamiltonians. An
effective hamiltonian with a small width, calculated including the first three
terms in the perturbative expansion, is projected on a small set of effective
basis states. The resulting small hamiltonian matrix is diagonalized and the
exact bound state energy is obtained with accuracy of order 10%. Then, a brief
description and an elementary illustration are given for a related light-front
Fock space operator method which aims at carrying out analogous steps for
hamiltonians of QCD and other theories.

20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex