The Kerr medium as an SU(2) system: exact solution for spin damping Adityapuram Sivaraman Vytheeswaran, Kamarajagadda Venkata Sesha Shiv Chaitanya, Prasanta Kumar Panigrahi and Venkatraman Srinivasan Eur. Phys. J. B, 87 9 (2014) 207 Published online: 16 September 2014 DOI: 10.1140/epjb/e2014-41102-x