Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Phase Transition in a Pseudo-hermitian Dicke model   We show that a Dicke-type pseudo-hermitian Hamiltonian undergoes quantum
phase transition by mapping it to the "Dressed Dicke Model" through a
similarity transformation. We find the positive-definite metric in the Hilbert
space of the pseudo-hermitian Hamiltonian so that it is unitary and allows a
consistent quantum description. Further, we obtain the limit in which the
pseudo-hermitian Hamiltonian is exactly solvable.

15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph