Symmetry and inflation

Details Symmetry and inflation Symmetry and inflation

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002phrvd..65f3517c&link_type=abstract

Physical Review D, vol. 65, Issue 6, id. 063517

Physics

28

Particle-Theory And Field-Theory Models Of The Early Universe

Scientific paper

We find the group of symmetry transformations under which the Einstein equations for the spatially flat Friedmann-Robertson-Walker universe are form invariant. They relate the energy density and the pressure of the fluid to the expansion rate. We show that inflation can be obtained from nonaccelerated scenarios by a symmetry transformation. We derive the transformation rule for the spectrum and spectral index of the curvature perturbations. Finally, the group is extended to investigate inflation in the anisotropic Bianchi type-I spacetime and the brane-world cosmology.

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