Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the wave dispersion and non-reciprocal power flow in space-time
  traveling acoustic metamaterials   This note analytically investigates non-reciprocal wave dispersion in locally
resonant acoustic metamaterials. Dispersion relations associated with
space-time varying modulations of inertial and stiffness parameters of the base
material and the resonant components are derived. It is shown that the
resultant dispersion bias onsets intriguing features culminating in a break-up
of both acoustic and optic propagation modes and one-way local resonance band
gaps. The derived band structures are validated using the full transient
displacement response of a finite metamaterial. A mathematical framework is
presented to characterize power flow in the modulated acoustic metamaterials to
quantify energy transmission patterns associated with the non-reciprocal
response. Since local resonance band gaps are size-independent and frequency
tunable, the outcome enables the synthesis of a new class of sub-wavelength
low-frequency one-way wave guides.

21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg