Collapse and dispersal of a homogeneous spin fluid in Einstein–Cartan theory M. Hashemi, S. Jalalzadeh and A. H. Ziaie Eur. Phys. J. C, 75 2 (2015) 53 Published online: 04 February 2015 DOI: 10.1140/epjc/s10052-015-3276-1