Dense gas in the Galactic central molecular zone is warm and heated by turbulence by Ginsburg, A, Henkel, C, Ao, Y, Riquelme, D, Kauffmann, J, Pillai, T, Mills, E, Requena-Torres, M, Immer, K, Testi, L, Ott, J, Bally, J, Battersby, C, Darling, J, Aalto, S, Stanke, T, Kendrew, S, Kruijssen, J, Longmore, S, Dale, J, Guesten, R, Menten, K