Scaling Cosmologies of N=8 Gauged Supergravity

Details Scaling Cosmologies of N=8 Gauged Supergravity Scaling Cosmologies of N=8 Gauged Supergravity

2006-10-12

arxiv.org/abs/hep-th/0610143v2

Class.Quant.Grav.24:2139-2152,2007

Physics

High Energy Physics

High Energy Physics - Theory

17 pages; referenced added, reportnr changed and some corrections in section 6

Scientific paper

10.1088/0264-9381/24/8/012

We construct exact cosmological scaling solutions in N=8 gauged supergravity. We restrict to solutions for which the scalar fields trace out geodesic curves on the scalar manifold. Under these restrictions it is shown that the axionic scalars are necessarily constant. The potential is then a sum of exponentials and has a very specific form that allows for scaling solutions. The scaling solutions describe eternal accelerating and decelerating power-law universes, which are all unstable. An uplift of the solutions to 11-dimensional supergravity is carried out and the resulting timedependent geometries are discussed. In the discussion we briefly comment on the fact that N=2 gauged supergravity allows stable scaling solutions.

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