Precision calculation of dark radiation from spinning primordial black holes and early matter-dominated eras
Precision calculation of dark radiation from spinning primordial black holes and early matter-dominated eras
We present precision calculations of dark radiation in the form of gravitons coming from Hawking evaporation of spinning primordial black holes (PBHs) in the early Universe. Our calculation incorporates a careful treatment of extended spin distributions of a population of PBHs, the PBH reheating temperature, and the number of relativistic …