The Landscape, the Swampland and the Era of Precision Cosmology

By Yashar Akrami, R. Kallosh, Andrei Linde, V. Vardanyan. Fortschritte der Physik, 2018

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We review the advanced version of the KKLT construction and pure d=4 de Sitter supergravity, involving a nilpotent multiplet, with regard to various conjectures that de Sitter state cannot exist in string theory. We explain why we consider these conjectures problematic and not well motivated, and why the recently proposed alternative string theory models of dark energy, ignoring vacuum stabilization, are ruled out by cosmological observations at least at the 3σ level, i.e. with more than 99.7% confidence.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/bb3b8dc8d06a2b3f8a2fd527deb1b288e192fc33