Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Simultaneous investigation of shear modulus and torsional resonance of
  solid 4He   We investigate the origin of a resonant period drop of a torsional oscillator
(TO) containing solid ${}^{4}$He by inspecting its relation to a change in
elastic modulus. To understand this relationship directly, we measure both
phenomena simultaneously using a TO with a pair of concentric piezoelectric
transducers inserted in its annulus. Although the temperature, ${}^{3}$He
concentration, and frequency dependence are essentially the same, a marked
discrepancy in the drive amplitude dependence is observed. We find that this
discrepancy originates from the anisotropic response of polycrystalline solid
${}^{4}$He connected with low-angle grain boundaries by studying the shear
modulus parallel to and perpendicular to the driving direction.

16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex