Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Infrasonic wave propagation in ultrasoft solids at low Reynolds numbers   The propagation of elastic waves in soft materials plays a crucial role in
the spatio-temporal transmission of mechanical signals, e.g. in biological
mechanotransduction or in the failure of marginal solids. At high Reynolds
numbers $Re \gg 1$, inertia dominates and wave propagation can be readily
observed. However, mechanical cues in soft and biological materials often occur
at low $Re$, where waves are overdamped. Not only have low $Re$ waves been
difficult to observe in experiments, their theoretical description remains
incomplete. In this paper, we present direct measurements of low $Re$ waves
propagating in ordered and disordered soft solids, generated by an oscillating
point force induced by an optical trap. We derive an analytical theory for low
$Re$ wave propagation, which is in excellent agreement with the experiments.
Our results present both a new method to characterize wave propagation in soft
solids and a theoretical framework to understand how localized mechanical
signals can provoke a remote and delayed response.

28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con