Axial gravity, massless fermions and trace anomaliesL. Bonora, M. Cvitan, P. Dominis Prester, A. Duarte Pereira, S. Giaccari and T. ŠtembergaEur. Phys. J. C, 77 8 (2017) 511DOI: https://doi.org/10.1140/epjc/s10052-017-5071-7