Schwinger Boson Theory of the Magnetic Spectrum of Ba$_3$CoSb$_2$O$_9$

E. A. Ghioldi,1, 2 Shang-Shun Zhang,1, 3 Yoshitomo Kamiya,4 L. O. Manuel,2 A. E. Trumper,2 and C. D. Batista1, 5, ∗ 1Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA 2Instituto de Física Rosario (CONICET) and Universidad Nacional de Rosario, Boulevard 27 de Febrero 210 bis, (2000) Rosario, Argentina 3School of Physics and Astronomy and William I. Fine Theoretical Physics Institute, University of Minnesota, Minneapolis, Minnesota 55455, USA 4School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China 5Shull Wollan Center A Joint Institute for Neutron Sciences, Oak Ridge National Laboratory, TN 37831. USA