Duality invariance and cosmological dynamics

Details Duality invariance and cosmological dynamics Duality invariance and cosmological dynamics

2006-09-23

arxiv.org/abs/gr-qc/0609104v3

Int.J.Mod.Phys.D17:2229-2254,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

14 pages, Discussion enlarged, accepted for publication in IJMPD

Scientific paper

10.1142/S0218271808013820

A duality transformation that interrelates expanding and contracting cosmological models is shown to single out a duality invariant, interacting two-component description of any irrotational, geodesic and shearfree cosmic medium with vanishing three curvature scalar. We apply this feature to a system of matter and radiation, to a mixture of dark matter and dark energy, to minimal and conformal scalar fields, and to an enlarged Chaplygin gas model of the cosmic substratum. We extend the concept of duality transformations to cosmological perturbations and demonstrate the invariance of adiabatic pressure perturbations under these transformations.

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