Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Rabi Hamiltonian in the dispersive regime   The Rabi Hamiltonian is studied in the dispersive regime and ultra-strong
coupling. We employ a recent unitary transformation to obtain not only the
approximate Hamiltonian and its energy levels but also its eigenfunctions. The
relationship of the approximation with other regimes and their approximations
are also discussed.

27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
3
The categories of this paper are: physics
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn