De Sitter space is realized as a path-integral expectation value of the metric in an excited state of SO(32) and E8xE8 heterotic theories via late-time M-theory duality, with effective-field-theory conditions shown equivalent to the null energy condition.
Duality in the type-ii superstring effective action.Nuclear Physics B, 451(3):547–575
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A Computational Companion to Transient de Sitter and Quasi de Sitter States in SO(32) and E_8 X E_8 Heterotic String Theories I: Formalisms
De Sitter space is realized as a path-integral expectation value of the metric in an excited state of SO(32) and E8xE8 heterotic theories via late-time M-theory duality, with effective-field-theory conditions shown equivalent to the null energy condition.