Quantum Hair Corrections to Primordial Black Hole Evaporation

Here, we calculate the modifications to Hawking evaporation of primordial black holes (PBH) arising from quantum hair in the Universal Quantum Gravity (UQG) framework. The quantum hair parameter Pi_h = 0.0237 +/- 0.0020, previously measured from gravitational wave ringdown observations, increases the black hole entropy and consequently enhances the Hawking temperature by Delta T / T approximately +0.0055%. This leads to an approximately 0.016% reduction in evaporation timescale and a corresponding decrease in the critical mass M_crit that evaporates within the age of the universe. We find M_crit(UQG) = (1.7296 +/- 0.0001) x 10^11 kg, approximately 9.4 x 10^6 kg (approximately 0.0055%) lower than the General Relativity prediction. While these corrections are too small to be observationally distinguished with current technology, they demonstrate the internal consistency of UQG across vastly different scales and establish that the theory correctly approaches the classical limit. Our results provide testable predictions for future gamma-ray observatories and constrain PBH contributions to dark matter.