Cosmological perturbations in generalised gravity theories: formulation.

Details Cosmological perturbations in generalised gravity theories: formulation. Cosmological perturbations in generalised gravity theories: formulation.

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990cqgra...7.1613j&link_type=abstract

Classical Quantum Gravity, Vol. 7, No. 9, p. 1613 - 1631

Mathematics

Logic

Cosmological Models: Gravitation Theory, Early Universe: Density Perturbations

Scientific paper

The author presents a simple way of deriving cosmological perturbation equations in generalized gravity theories which accounts for metric perturbations in a gauge invariant way. The author uses an imperfect fluid formulation of the perturbation equations developed in Einstein gravity and absorbs all new contributions as effective fluid quantities. This approach is applied to a generalized Lagrangian which includes most of the gravity theories employing a scalar field and scalar curvature. Background and perturbation equations are displayed for specific gravity theories which can be recovered as special cases from the above general Lagrangian.

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