Cosmological perturbations in a sixth-order gravity.

Details Cosmological perturbations in a sixth-order gravity. Cosmological perturbations in a sixth-order gravity.

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991cqgra...8l.133j&link_type=abstract

Classical Quantum Gravity, Vol. 8, No. 6, p. L133 - L136

Mathematics

Logic

1

Cosmological Models: Density Perturbations, Cosmological Models: Gravitation Theory

Scientific paper

The author presents cosmological perturbation equations for a theory with the Lagrangian L ≡ f(R) + γRR;c;c, where the second term leads to a sixth-order theory in the metric. Equations for both density and gravitational wave perturbations are derived in a gauge-invariant way where the density perturbation equation becomes a fourth-order differential equation. The integral form solution of the gravitational wave perturbations in the large scale is shown and it can be applied to a wide variety of gravity theories.

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