Coarsening dynamics in the Vicsek model of active matter Nisha Katyal, Supravat Dey, Dibyendu Das and Sanjay Puri Eur. Phys. J. E, 43 2 (2020) 10 Published online: 10 February 2020 DOI: 10.1140/epje/i2020-11934-3