The role of potential in the ghost-condensate dark energy model Gour Bhattacharya, Pradip Mukherjee, Amit Singha Roy and Anirban Saha Eur. Phys. J. C, 75 2 (2015) 84 Published online: 20 February 2015 DOI: 10.1140/epjc/s10052-015-3301-4