Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Oriented Active Solids   We present a complete analysis of the linearised dynamics of active solids
with orientational order, taking into account a hitherto overlooked consequence
of rotation invariance. Our predictions include the possibility of stable
active solids with quasi-long-range order in two dimensions and long-range
order in three dimensions, generic instability of the solid for one sign of
active forcing, and the instability of the orientationally ordered phase in
momentum-conserved systems for large active forcing irrespective of its sign.

2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
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The categories of this paper are: stat
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
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The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ