Toward a No-Go theorem for an accelerating universe through a nonlinear backreaction

Masumi Kasai, Hideki Asada, Toshifumi Futamase

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

The backreaction of nonlinear inhomogeneities to the cosmic expansion is re-analyzed in the framework of general relativity. Apparent discrepancies regarding the effect of the nonlinear backreaction, which exist among the results of previous works in different gauges, are resolved. By defining the spatially averaged matter energy density as a conserved quantity in the large comoving volume, it is shown that the nonlinear backreaction neither accelerates nor decelerates the cosmic expansion in a matter-dominated universe. The present result in the Newtonian gauge is consistent with the previous results obtained in the comoving synchronous gauge. Although our work does not give a complete proof, it strongly suggests the following no-go theorem: No cosmic acceleration occurs as a result of the nonlinear backreaction via averaging.

Original languageEnglish
Pages (from-to)827-832
Number of pages6
JournalProgress of Theoretical Physics
Volume115
Issue number4
DOIs
Publication statusPublished - 2006 Apr

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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