Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Metric approach for sound propagation in nematic liquid crystals   In the eikonal approach, we describe sound propagation near to topological
defects of nematic liquid crystal as geodesics of a non-euclidian manifold
endowed with an effective metric tensor. The relation between the acoustics of
the medium and this geometrical description is given by Fermat's principle. We
calculate the ray trajectories and propose a diffraction experiment to retrieve
informations about the elastic constants.

36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg