Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mathematical Analyses of an accelerating (Griffiths-Podolsky) Black Hole   An exact solution of Einsteins equations which represents a pair of
accelerating and rotating black holes was presented by J. B. Griffiths and J.
Podolsky [2]. In the paper [2] they have shown the explicit form of a spinning
C-metric starting from the Plebanski-Demianski metric, and transformed it using
NUT and angular velocity parameters in addition to the usual parameters and
thus gave a generalized form of such solutions. In the forthcoming discussion,
an attempt has been made to realize the Riemann components of the proposed
metric. Furthermore, certain optical characteristics of the metric have been
analyzed using the Newman-Penrose formalism.

17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas