Knotty inflation and the dimensionality of spacetime Arjun Berera, Roman V. Buniy, Thomas W. Kephart, Heinrich Päs and João G. Rosa Eur. Phys. J. C, 77 10 (2017) 682 Published online: 14 October 2017 DOI: 10.1140/epjc/s10052-017-5253-3