Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A new class of solutions of anisotropic charged distributions on
  pseudo-spheroidal spacetime   In the present article a new class of exact solutions of Einstein's field
equations for charged anisotropic distribution is obtained on the background of
pseudo-spheroidal spacetime characterized by the metric potential
$g_{rr}=\frac{1+K\frac{r^2}{R^2}}{1+\frac{r^2}{R^2}}$, where $K$ and $R$ are
geometric parameters of the spacetime. The radial pressure $p_r$ and electric
field intensity $E$ are taken in the form $8\pi p_r =
\frac{K-1}{R^2}\frac{\left(1-\frac{r^2}{R^2} \right)}{\left(1+K\frac{r^2}{R^2}
\right)^2}$ and $E^2 =
\frac{\alpha(K-1)\frac{r^2}{R^2}}{R^2\left(1+K\frac{r^2}{R^2} \right)^2}$. The
bounds of geometric parameter $K$ and the parameter $\alpha$ appearing in the
expression of $E^2$ are obtained by imposing the requirements for a physically
acceptable model. It is found that the model is in good agreement with the
observational data of number of compact stars like 4U 1820-30, PSR J1903+327,
4U 1608-52, Vela X-1, PSR J1614-2230, Cen X-3 given by Gangopadhyay {\em{et
al}} [Gangopadhyay T., Ray S., Li X-D., Dey J. and Dey M., {\it Mon. Not. R.
Astron. Soc.} {\bf431} (2013) 3216]. When $\alpha = 0$, the model reduces to
the uncharged anisotropic distribution given by Ratanpal {\em et al.} [Ratanpal
B. S., Thomas V. O. and Pandya D. M., arXiv:1506.08512 [gr-qc](2015)]

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The categories of this paper are: physics
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The categories of this paper are: hep-th
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The categories of this paper are: hep-ex
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph
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The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
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The categories of this paper are: cs
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-bio
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: nlin