Boundary Inflation

Details Boundary Inflation Boundary Inflation

1999-02-10

arxiv.org/abs/hep-th/9902071v2

Phys.Rev. D61 (2000) 023506

Physics

High Energy Physics

High Energy Physics - Theory

35 pages, Latex, one eps-figure

Scientific paper

10.1103/PhysRevD.61.023506

Inflationary solutions are constructed in a specific five-dimensional model with boundaries motivated by heterotic M-theory. We concentrate on the case where the vacuum energy is provided by potentials on those boundaries. It is pointed out that the presence of such potentials necessarily excites bulk Kaluza-Klein modes. We distinguish a linear and a non-linear regime for those modes. In the linear regime, inflation can be discussed in an effective four-dimensional theory in the conventional way. We lift a four-dimensional inflating solution up to five dimensions where it represents an inflating domain wall pair. This shows explicitly the inhomogeneity in the fifth dimension. We also demonstrate the existence of inflating solutions with unconventional properties in the non-linear regime. Specifically, we find solutions with and without an horizon between the two boundaries. These solutions have certain problems associated with the stability of the additional dimension and the persistence of initial excitations of the Kaluza-Klein modes.

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