Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A toy model of bosonic non-canonical quantum field   A harmonic oscillator is an indefinite-frequency one if the parameter
$\omega$ is replaced by an operator. An ensemble of $N$ such oscillators may be
regarded as a toy model of a bosonic quantum field. All the possible
frequencies associated with a given problem are present already in a single
oscillator and $N$ can be finite. Due to the operator character of $\omega$ the
resulting algebra of creation-annihilation operators is non-canonical. In the
limit of large $N$ one recovers perturbation theory formulas of the canonical
quantum field theory but with form factors automatically built in. Vacuum
energy of the ensemble is finite, a fact discussed in the context of the
cosmological constant problem. Space of states is given by a vector bundle with
Fock-type fibers. Interactions of the field with 2-level systems, including
Rabi oscillations and spontaneous emission, are discussed in detail.

27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an