Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Wave propagation through disordered media without backscattering and
  intensity variations   A fundamental manifestation of wave scattering in a disordered medium is the
highly complex intensity pattern the waves acquire due to multi-path
interference. Here we show that these intensity variations can be entirely
suppressed by adding disorder-specific gain and loss components to the medium.
The resulting constant-intensity (CI) waves in such non-Hermitian scattering
landscapes are free of any backscattering and feature perfect transmission
through the disorder. An experimental demonstration of these unique wave states
is envisioned based on spatially modulated pump beams that can flexibly control
the gain and loss components in an active medium.

2
The categories of this paper are: math
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th