2007/11/30 by Oliver J. Rosten
Physics and Astronomy · #astro-ph #hep-ph #hep-th
paper · pdf · doi:10.1088/1475-7516/2008/01/029
published as JCAP0801:029,2008 · 2 pages, v2: refs added, published in JCAP
arxiv created 2008/02/01 · arxiv updated 2009/12/01
It is pointed out that the exact renormalization group approach to cosmological perturbation theory, proposed in Matarrese and Pietroni, JCAP 0706 (2007) 026, arXiv:astro-ph/0703563 and arXiv:astro-ph/0702653, constitutes a misnomer. Rather, having instructively cast this classical problem into path integral form, the evolution equation then derived comes about as a special case of considering how the generating functional responds to variations of the primordial power spectrum.