Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Greybody Radiation of scalar and Dirac perturbations of NUT Black Holes   We consider the spinorial wave equations, namely the Dirac and the
Klein-Gordon equations, and greybody radiation in the NUT black hole spacetime.
To this end, we first study the Dirac equation in NUT spacetime by using a null
tetrad in the Newman-Penrose (NP) formalism. Next, we separate the Dirac
equation into radial and angular sets. The angular set is solved in terms of
associated Legendre functions. With the radial set, we obtain the decoupled
radial wave equations and derive the one-dimensional Schr\"odinger wave
equations together with effective potentials. Then, we discuss the potentials
by plotting them as a function of radial distance in a physically acceptable
region. We also study the Klein-Gordon equation to compute the greybody factors
(GFs) for both bosons and fermions. The influence of the NUT parameter on the
GFs of the NUT spacetime is investigated in detail.

14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
2
The categories of this paper are: math
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con