A Comment on the Path Integral Approach to Cosmological Perturbation Theory

Details A Comment on the Path Integral Approach to Cosmological Perturbation Theory A Comment on the Path Integral Approach to Cosmological Perturbation Theory

2007-11-06

arxiv.org/abs/0711.0867v2

JCAP0801:029,2008

Astronomy and Astrophysics

Astrophysics

2 pages, v2: refs added, published in JCAP

Scientific paper

10.1088/1475-7516/2008/01/029

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.

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