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Consistent effective theory of long-wavelength cosmological perturbations

Oct 10, 2013

17 pages

Published in:

Phys.Rev.D 90 (2014) 2, 023518

Published: Jul 11, 2014

e-Print:

1310.2920 [hep-th]

DOI:

10.1103/PhysRevD.90.023518

Report number:

CALT-68-2864

View in:

ADS Abstract Service

reference search121 citations

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Abstract: (APS)

Effective field theory provides a perturbative framework to study the evolution of cosmological large-scale structure. We investigate the underpinnings of this approach, and suggest new ways to compute correlation functions of cosmological observables. We find that, in contrast with quantum field theory, the appropriate effective theory of classical cosmological perturbations involves interactions that are nonlocal in time. We describe an alternative to the usual approach of smoothing the perturbations, based on a path-integral formulation of the renormalization group equations. This technique allows for improved handling of short-distance modes that are perturbatively generated by long-distance interactions.

95.35.+d
11.10.-z
98.65.Dx
98.80.-k
perturbation
effective field theory
renormalization group
correlation function
field theory
path integral

References(15)

Figures(5)

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