In single-field, slow-roll inflationary models scalar and tensorial (Gaussian) perturbations are usually characterized by the so called power spectrum in momentum space. Even though these power spectra are finite and well define in momentum space, typical ultraviolet divergences in quantum field theory appear when these quantities are expressed in position space. The requirement of a finite variance in position space forces the introduction of regularization technics in quantum field theory in an expanding universe. The regularization process has an important impact on the predicted scalar and tensorial power spectra for wavelengths that today are at observable scales. © Published under licence by IOP Publishing Ltd.
Publication Source (Journal or Book title)
Journal of Physics: Conference Series
Agullo, I. (2011). The effects of quantum field renormalization on the predictions of inflation for the CMB anisotropies. Journal of Physics: Conference Series, 314 (1) https://doi.org/10.1088/1742-6596/314/1/012051