Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pseudo Parity-Time Symmetry in Optical Systems   We introduce a novel concept of the {\em pseudo} parity-time ($\mathcal{PT}$)
symmetry in periodically modulated optical systems with balanced gain and loss.
We demonstrate that whether the original system is $\mathcal{PT}$-symmetric or
not, we can manipulate the property of the $\mathcal{PT}$ symmetry by applying
a periodic modulation in such a way that the effective system derived by the
high-frequency Floquet method is $\mathcal{PT}$ symmetric. If the original
system is non-$\mathcal{PT}$ symmetric, the $\mathcal{PT}$ symmetry in the
effective system will lead to quasi-stationary propagation that can be
associated with the \emph{pseudo $\mathcal{PT}$ symmetry}. Our results provide
a promising approach for manipulating the $\mathcal{PT}$ symmetry of realistic
systems.

21
The categories of this paper are: adap-org
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
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int