1 Erratum to: Eur. Phys. J. C (2022) 82:82 https://doi.org/10.1140/epjc/s10052-022-10043-3

In the original article the following typesetting mistakes were corrected:

  1. 1.

    In the first line of the abstract “Klein-shGordon” should be “Klein-Gordon”.

  2. 2.

    “ccc” should be removed from the metric tensors in equations (4), (29), (30), (42), and (43).

The original article has been corrected. The publisher apologizes for the inconvenience caused.