Cosmological implications of photon-flux upper limits at ultrahigh energies in scenarios of Planckian-interacting massive particles for dark matter - Abreu, Pedro T.; Catalani, Fernando; Souza, Vitor de; Oliveira, Cainã de; Armand, Johnnier Pérez; Santos, Edivaldo Moura; Peixoto, Carlos Jose Todero (Physical Review D, 2023)