Warm-tachyon Gauss–Bonnet inflation in the light of Planck 2015 data Meysam Motaharfar and Hamid Reza Sepangi Eur. Phys. J. C, 76 11 (2016) 646 Published online: 24 November 2016 DOI: 10.1140/epjc/s10052-016-4474-1