Constraints on String Cosmology

Details Constraints on String Cosmology Constraints on String Cosmology

2011-10-03

arxiv.org/abs/1110.0545v4

Physics

High Energy Physics

High Energy Physics - Theory

22 pages; LaTeX; LaTeX issue fixed; references and a few comments added; typo in Appendix fixed

Scientific paper

String theory contains sources like orientifold planes that support higher derivative interactions. These interactions make possible static flux compactifications which are forbidden in supergravity. They can also lead to violations of the strong energy condition (SEC) which is needed for an accelerating universe. We examine how large a violation is possible in the context of the heterotic string compactified to four dimensions. We find that de Sitter solutions are still not possible but that classically forbidden anti-de Sitter solutions are possible.

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