Phys. Rev. D 71, 084016 (2005) [5 pages]Separate universe and the back reaction of long wavelength fluctuationsReceived 27 February 2005; published 15 April 2005 We investigate the back reaction of cosmological long wavelength perturbations on the evolution of the Universe. By applying the renormalization group method to a Friedmann-Robertson-Walker universe with long wavelength fluctuations, we demonstrate that the renormalized solution with the back reaction effect is equivalent to that of the separate universe. Then, using the effective Friedmann equation, we show that only the nonadiabatic mode of long wavelength fluctuations affects the expansion law of the spatially averaged universe. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.71.084016
DOI:
10.1103/PhysRevD.71.084016
PACS:
04.25.Nx, 98.80.Qc
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