Instanton Cosmology and Domain Walls from M-theory and String Theory

Details Instanton Cosmology and Domain Walls from M-theory and String Theory Instanton Cosmology and Domain Walls from M-theory and String Theory

1998-07-08

arxiv.org/abs/hep-th/9807051v2

Nucl.Phys.B543:321-364,1999

Physics

High Energy Physics

High Energy Physics - Theory

51 pages, Latex (3 times). Discussion and references added

Scientific paper

10.1016/S0550-3213(98)00764-0

The recent proposal by Hawking and Turok for obtaining an open inflationary universe from singular instantons makes use of low-energy effective Lagrangians describing gravity coupled to scalars and non-propagating antisymmetric tensors. In this paper we derive some exact results for Lagrangians of this type, obtained from spherical compactifications of M-theory and string theory. In the case of the S^7 compactification of M-theory, we give a detailed discussion of the cosmological solutions. We also show that the lower-dimensional Lagrangians admit domain-wall solutions, which preserve one half of the supersymmetry, and which approach AdS spacetimes near their horizons.

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