Inflation, Singular Instantons and Eleven Dimensional Cosmology

Abstract

We investigate cosmological solutions of eleven dimensional supergravity compactified on a squashed seven manifold. The effective action for the four dimensional theory contains scalar fields describing the size and squashing of the compactifying space. The potential for these fields consists of a sum of exponential terms. At early times only one such term is expected to dominate. The condition for an exponential potential to admit inflationary solutions is derived and it is shown that inflation is not possible in our model. The criterion for an exponential potential to admit a Hawking-Turok instanton is also derived. It is shown that the instanton remains singular in eleven dimensions.

20 pages, no figures, REVTeX, typos corrected and reference added

References in corpus (3)

• Open Inflation Without False Vacua
• Open Inflation, the Four Form and the Cosmological Constant
• Instantons from Low Energy String Actions

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