Abstract
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 the relative importance of the oscillations grows logarithmically. Their effect on the cosmological expansion resembles that of dark energy.
- Received 19 March 2002
DOI:https://doi.org/10.1103/PhysRevD.66.045001
©2002 American Physical Society