Further exact cosmological solutions to higher-order gravity theories

We investigate the effect of deviations from general relativity on approach to the initial singularity by finding exact cosmological solutions to a wide class of fourth-order gravity theories. We present new anisotropic vacuum solutions of modified Kasner type and demonstrate the extent to which they are valid in the presence of non-comoving perfect-fluid matter fields. The infinite series of Mixmaster oscillations seen in general relativity will not occur in these solutions, except in unphysical cases.

98.80.Jk
04.20.Jb
cosmological model
gravitation: higher-order
singularity
space-time: anisotropy
field equations: solution

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