Thorne, B., Fujita, T., Hazumi, M., Katayama, N., Komatsu, E., & Shiraishi, M. (2018). Finding the chiral gravitational wave background of an axion-SU(2) inflationary model using CMB observations and laser interferometers. Physical Review D, 97(4): 043506. doi:10.1103/PhysRevD.97.043506.