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Prog. Theor. Phys. Vol. 117 No. 1 (2007) pp. 183-188
Letters
A Phantom Does Not Result from a Backreaction
Hisako Tanaka* and
Toshifumi Futamase**
Astronomical Institute, Tohoku University, Sendai 980-8578, Japan
(Received October 31, 2006)
Abstract:
The backreaction of nonlinear inhomogeneities to the cosmic expansion
is analyzed in the framework of general relativity with a cosmological
constant. By defining the spatially averaged matter energy density,
we find that the cosmological constant induces a new type of
backreaction whose equation of state is
p=-4/3 ρ, where ρ and p are the effective energy density
and effective pressure of the backreaction in the averaged Friedmann universe.
However, the effective density is negative, and thus it decreases the
acceleration caused by the cosmological constant.
URL :
http://ptp.ipap.jp/link?PTP/117/183/
DOI : 10.1143/PTP.117.183
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