Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Study of a 43 day optical quasi-periodic oscillation for BL Lac S5
  0716+714   The data for BL Lac object S5 0716+714 optical B, R and I bands are collected
from November 10, 2017 to May 15, 2018. The raw data consists of 21396
quasi-simultaneous multi-band points, with 7132 data points for each band. To
search for the quasi-periodic oscillation (QPO) signal of S5 0716+714, the Lomb
Scargle periodogram (LSP) method and the Weighted Wavelet Z-transform (WWZ)
method are used, and the light curve simulation method is utilized to estimate
the significance level of the QPO. For the first time, a QPO with 43-day (> 95%
confidence level) of approximate moon-like oscillations is revealed using these
techniques. Furthermore, further research indicates that optical radiation is
produced as a result of relativistic jet. This 43-day QPO can be explained by a
spiral motion of a blob with velocity $\vec \beta$ along the jet. In addition,
this 43-day QPO is superimposed on a longer QPO, and this superposition
phenomenon can explain the linear upward trend. The viewing angle of the blob
undergoes periodic changes, while jet precession results in a longer QPO. When
the longer QPO fluxes are increasing state, a periodic rising tendency may be
observed.

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The categories of this paper are: stat
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
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The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
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The categories of this paper are: nlin
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The categories of this paper are: q-alg
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The categories of this paper are: ao-sci
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The categories of this paper are: q-fin
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The categories of this paper are: math