Reflected waves and quantum gravity

In the context of canonical quantum gravity, we consider effects a nonstandard expression for gravitational wave function on evolution inflationary perturbations. Such an and its may be generated by sudden variation in (nearly constant) inflaton potential. The resulting primordial spectra, up to leading order, are affected short long wavelength regime, where oscillatory behavior with non-negligible amplitude is superimposed standard semiclassical result. Moreover, novel, nonperturbative, approach used study evolution. Finally, simplified application fully illustrated commented.