Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Kerr metric bundles. Killing horizons confinement, light-surfaces and
  horizons replicas   We provide a complete characterization of the metric Killing bundles (or
metric bundles) of the Kerr geometry. Metric bundles, first introduced in [21]
can be generally defined for axially symmetric spacetimes with Killing horizons
and, for the case of Kerr geometries, are sets of black holes (BHs) or black
holes and naked singularities (NSs) geometries. Each metric of a bundle has an
equal limiting photon (orbital) frequency, which defines the bundle and
coincides with the frequency of a Killing horizon in the extended plane. In
this plane each bundle is represented as a curve tangent to the curve that
represents the horizons, which thus emerge as the envelope surfaces of the
metric bundles. We show that the horizons frequency can be used to establish a
connection between BHs and NSs, providing an alternative representation of such
spacetimes in the extended plane and an alternative definition of the BH
horizons. We introduce the concept of inner horizon confinement and horizons
replicas and study the possibility of detecting their frequencies. We study the
bundle characteristic frequencies constraining the inner horizon confinement in
the outer region of the plane i.e. the possibility of detect frequency related
to the inner horizon, and the horizons replicas, structures which may be
detectable, for example, from the emission spectra of BHs spacetimes. It is
shown that such observations can be performed close to the rotation axis of the
Kerr geometry, depending on the BH spin. We argue that these results could be
used to further investigate black holes and their thermodynamic properties.

11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
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The categories of this paper are: q-fin
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex