A weak instability in an expanding universe?

Details A weak instability in an expanding universe? A weak instability in an expanding universe?

2002-03-09

arxiv.org/abs/hep-th/0203087v2

Phys.Rev. D66 (2002) 045001

Physics

High Energy Physics

High Energy Physics - Theory

14 pages, 4 figures, minor changes to conform to published version

Scientific paper

10.1103/PhysRevD.66.045001

We use higher derivative classical gravity to study the nonlinear coupling between the cosmological expansion of the universe and metric oscillations of Planck frequency and very small amplitude. We derive field equations at high orders in the derivative expansion and find that the nature of the new dynamics is extremely restricted. For the equation of state parameter $w>0$ the relative importance of the oscillations grows logarithmically. Their effect on the cosmological expansion resembles that of dark energy.

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