This ICNF 2019 paper by Handel and Splett examines cosmic nonstationarity of the coherent gravidynamic quantum 1/f effect. The research investigates how expansion of the universe and cosmological evolution affect gravidynamic quantum 1/f noise, showing that coherent gravitational quantum noise exhibits time-dependent characteristics reflecting cosmological parameters, potentially providing new observational tests of cosmology and quantum gravity through analysis of long-term frequency stability measurements in precision oscillators and atomic clocks.