Possible existence of wormholes in the galactic halo region Farook Rahaman, P. K. F. Kuhfittig, Saibal Ray and Nasarul Islam Eur. Phys. J. C, 74 2 (2014) 2750 Published online: 12 February 2014 DOI: 10.1140/epjc/s10052-014-2750-5