A Comment on the Path Integral Approach to Cosmological Perturbation Theory

Abstract

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.

2 pages, v2: refs added, published in JCAP

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Cited by in corpus (6)

• Resumming Cosmological Perturbations via the Lagrangian Picture: One-loop Results in Real Space and in Redshift Space
• Nonlinear perturbation theory with halo bias and redshift-space distortions via the Lagrangian picture
• Multi-Point Propagators in Cosmological Gravitational Instability
• Large-scale structure perturbation theory without losing stream crossing
• Renormalization group computation of likelihood functions for cosmological data sets
• Cosmological functional renormalisation group, extended Galilean invariance and the sweeping effect