1 Erratum to: Eur. Phys. J. C (2014) 74:2887 https://doi.org/10.1140/epjc/s10052-014-2887-2

The following are algebraic corrections in the published version of the above entitled paper:

  • In Page-2, the Eq. (7) should be changed to

    (1)

  • In Page-2, the Eq. (10) should be changed to

    $$\begin{aligned} {\mathcal {A}}_{\pm }= & {} \int _{0}^{\pi }\int _{0}^{2\pi } \sqrt{g_{\theta \theta }\,g_{\phi \phi }}\, d\theta \,d\phi = 4\pi \left( r_{\pm }^2+a^2\right) . \end{aligned}$$
    (2)

  • In Page-4, the Eq. (54) should be changed to

    $$\begin{aligned} {\mathcal {E}}_{r,\pm }= & {} \frac{\eta _{\pm }}{2}\left[ \frac{1}{\sqrt{1-{\beta _{0,\pm }}^2}}-1 \right] ~. \end{aligned}$$
    (3)

  • In Page-4, the Eq. (55) should be changed to

    $$\begin{aligned} {\mathcal {E}}_{em, \pm }= & {} \frac{\eta _{\pm }}{2}\left[ \frac{1+{\epsilon _{\pm }}^2}{\sqrt{1-{\beta _{\pm }}^2}}- \frac{1}{\sqrt{1-{\beta _{0,\pm }}^2}} \right] . \end{aligned}$$
    (4)

    where

    $$\begin{aligned} \beta _{0,\pm }=\beta _{\pm }\left( {\mathcal {A}}_{\pm }, J, Q=0 \right) \end{aligned}$$

  • In Page-5, the Eq. (60) should be changed to

    (5)

The conclusion of the paper remains unchanged.