Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Super-spinning compact objects and models of high-frequency
  quasi-periodic oscillations observed in Galactic microquasars   We have previously applied several models of high-frequency quasi-periodic
oscillations (HF QPOs) to estimate the spin of the central Kerr black hole in
the three Galactic microquasars, GRS 1915+105, GRO J1655-40, and XTE J1550-564.
Here we explore the alternative possibility that the central compact body is a
super-spinning object (or a naked singularity) with the external space-time
described by Kerr geometry with a dimensionless spin parameter a = cJ/GM2 >
1.We calculate the relevant spin intervals for a subset of HF QPO models
considered in the previous study. Our analysis indicates that for all but one
of the considered models there exists at least one interval of a > 1 that is
compatible with constraints given by the ranges of the central compact object
mass independently estimated for the three sources. For most of the models, the
inferred values of a are several times higher than the extreme Kerr black hole
value a = 1. These values may be too high since the spin of superspinars is
often assumed to rapidly decrease due to accretion when a >> 1. In this
context, we conclude that only the epicyclic and the Keplerian resonance model
provides estimates that are compatible with the expectation of just a small
deviation from a = 1.

14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph