Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Complete absorption of topologically protected waves   Chiral edge states can transmit energy along imperfect interfaces in a
topologically robust and unidirectional manner when protected by bulk-boundary
correspondence. However, in continuum systems, the number of states at an
interface can depend on boundary conditions. Here we design interfaces that
host a net flux of the number of modes into a region, trapping incoming energy.
As a realization, we present a model system of two topological fluids composed
of counter-spinning particles, which are separated by a boundary that
transitions from a fluid-fluid interface into a no-slip wall. In these fluids,
chiral edge states disappear, which implies non-Hermiticity and leads to a
novel interplay between topology and energy dissipation. Solving the fluid
equations of motion, we find explicit expressions for the disappearing modes.
We then conclude that energy dissipation is sped up by mode trapping. Instead
of making efficient waveguides, our work shows how topology can be exploited
for applications towards acoustic absorption, shielding, and soundproofing.

2
The categories of this paper are: math
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas