Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A nonperturbative light-front coupled-cluster method   The nonperturbative Hamiltonian eigenvalue problem for bound states of a
quantum field theory is formulated in terms of Dirac's light-front coordinates
and then approximated by the exponential-operator technique of the many-body
coupled-cluster method. This approximation eliminates any need for the usual
approximation of Fock-space truncation. Instead, the exponentiated operator is
truncated, and the terms retained are determined by a set of nonlinear integral
equations. These equations are solved simultaneously with an effective
eigenvalue problem in the valence sector, where the number of constituents is
small. Matrix elements can be calculated, with extensions of techniques from
standard coupled-cluster theory, to obtain form factors and other observables.

27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an