Hyperbolic symmetries, inflaton–phantom cosmology, and inflation R. Cartas-Fuentevilla, A. Escalante-Hernandez, A. Herrera-Aguilar and R. Gonzalez-Cuaglia Eur. Phys. J. Plus, 135 6 (2020) 529 Published online: 27 June 2020 DOI: 10.1140/epjp/s13360-020-00513-6