Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: QPO frequency derivative - frequency correlation indicates non-Keplerian
  boundary layer with a maximum in rotation rate   The correlation between the frequency and the absolute value of the frequency
derivative of the kilohertz QPOs observed for the first time from 4U 1636-53 is
a simple consequence and indicator of the existence of a non-Keplerian rotation
rate in the accretion disk boundary layer. This paper interprets the observed
correlation, showing that the observations provide strong evidence in support
of the fundamental assumption of disk accretion models around slow rotators,
that the boundary layer matches the Keplerian disk to the neutron star
magnetosphere.

29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org