Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-01-23
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.
Copeland Edmund J.
Ellison James
Lukas Andre
Roberts Jonathan
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