Axions, WIMPs, proton decay and observable r in SO(10) Nobuchika Okada, Digesh Raut and Qaisar Shafi Eur. Phys. J. C, 83 4 (2023) 273 Published online: 03 April 2023 DOI: 10.1140/epjc/s10052-023-11378-1