Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2011-10-03
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.
Green Stephen R.
Martinec Emil J.
Quigley Callum
Sethi Savdeep
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