Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Solutions of the spatially-dependent mass Dirac equation with the spin
  and pseudo-spin symmetry for the Coulomb-like potential   We study the effect of spatially dependent mass function over the solution of
the Dirac equation with the Coulomb potential in the (3+1)-dimensions for any
arbitrary spin-orbit $\kappa $ state$.$ In the framework of the spin and
pseudospin symmetry concept, the analytic bound state energy eigenvalues and
the corresponding upper and lower two-component spinors of the two Dirac
particles are obtained by means of the Nikiforov-Uvarov method, in closed form.
This physical choice of the mass function leads to an exact analytical solution
for the pseudospin part of the Dirac equation. The special cases $% \kappa =\pm
1$ ($l=\widetilde{l}=0,$ i.e., s-wave)$,$ the constant mass and the
non-relativistic limits are briefly investigated.

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The categories of this paper are: cmp-lg
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The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
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The categories of this paper are: alg-geom
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The categories of this paper are: supr-con
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The categories of this paper are: eess
25
The categories of this paper are: patt-sol
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The categories of this paper are: atom-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph