Remarks on the renormalization of primordial cosmological perturbations
  We briefly review the need to perform renormalization of inflationary perturbations to properly work out the physical power spectra. We also summarize the basis of (momentum-space) renormalization in curved spacetime and address several misconceptions found in recent literature on this subject. 
Ivan Agullo, Jose Navarro-Salas, Gonzalo J. Olmo, Leonard Parker
gr-qc astro-ph.CO hep-th