Cosmological Solutions of Low-Energy Heterotic M-Theory

Details Cosmological Solutions of Low-Energy Heterotic M-Theory Cosmological Solutions of Low-Energy Heterotic M-Theory

2006-01-23

arxiv.org/abs/hep-th/0601173v2

Phys.Rev.D73:086009,2006

Physics

High Energy Physics

High Energy Physics - Theory

24 pages, 2 tables, 9 eps figures; minor corrections to content

Scientific paper

10.1103/PhysRevD.73.086009

We derive a set of exact cosmological solutions to the D=4, N=1 supergravity description of heterotic M-theory. Having identified a new and exact SU(3) Toda model solution, we then apply symmetry transformations to both this solution and to a previously known SU(2) Toda model, in order to derive two further sets of new cosmological solutions. In the symmetry-transformed SU(3) Toda case we find an unusual "bouncing" motion for the M5 brane, such that this brane can be made to reverse direction part way through its evolution. This bounce occurs purely through the interaction of non-standard kinetic terms, as there are no explicit potentials in the action. We also present a perturbation calculation which demonstrates that, in a simple static limit, heterotic M-theory possesses a scale-invariant isocurvature mode. This mode persists in certain asymptotic limits of all the solutions we have derived, including the bouncing solution.

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