Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Flux Modulation from Non-Axisymmetric Stuctures in Accretion Discs   Non-axisymmetric accretion discs can lead to flux variability. Here we
provide an analytic framework for modeling non-axisymmetric structures like
hotspots and spiral waves and their influence on observed timing measurements.
The presently unexplained Low-frequency Quasi-Periodic Oscillations (LFQPO),
observed in X-ray binaries and cataclysmic variables, could be the result of
such discs. Our framework serves as a guide to quantify the properties that
non-axisymmetric structures produced by nonlinear accretion disc models must
have in order to explain observed features such as LFQPOs. The results from our
microquasar appliations also provide analogous predictions for X-ray modulation
in active galactic nuclei. The formalism and physical interpration is of
practical use for generic non-axisymmetric accretion disc systems.

9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph