Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search methods for continuous gravitational-wave signals from unknown
  sources in the advanced-detector era   Continuous gravitational waves are long-lasting forms of gravitational
radiation produced by persistent quadrupolar variations of matter. Standard
expected sources for ground-based interferometric detectors are neutron stars
presenting non-axisymmetries such as crustal deformations, r-modes or free
precession. More exotic sources could include decaying ultralight boson clouds
around spinning black holes. A rich suite of data-analysis methods spanning a
wide bracket of thresholds between sensitivity and computational efficiency has
been developed during the last decades to search for these signals. In this
work, we review the current state of searches for continuous gravitational
waves using ground-based interferometer data, focusing on searches for unknown
sources. These searches typically consist of a main stage followed by several
post-processing steps to rule out outliers produced by detector noise. So far,
no continuous gravitational wave signal has been confidently detected, although
tighter upper limits are placed as detectors and search methods are further
developed.

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The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
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The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom