000181866 001__ 181866 000181866 005__ 20190316235510.0 000181866 0247_ $$2doi$$a10.1007/JHEP10(2012)124 000181866 022__ $$a1126-6708 000181866 02470 $$2ISI$$a000310851600009 000181866 037__ $$aARTICLE 000181866 245__ $$aMetastable de Sitter vacua in N=2 to N=1 truncated supergravity 000181866 269__ $$a2012 000181866 260__ $$bSpringer$$c2012$$aNew York 000181866 300__ $$a36 000181866 336__ $$aJournal Articles 000181866 520__ $$aWe study the possibility of achieving metastable de Sitter vacua in general N=2 to N=1 truncated supergravities without vector multiplets, and compare with the situations arising in N=2 theories with only hypermultiplets and N=1 theories with only chiral multiplets. In N=2 theories based on a quaternionic manifold and a graviphoton gauging, de Sitter vacua are necessarily unstable, as a result of the peculiar properties of the geometry. In N=1 theories based on a Kahler manifold and a superpotential, de Sitter vacua can instead be metastable provided the geometry satisfies some constraint and the superpotential can be freely adjusted. In N=2 to N=1 truncations, the crucial requirement is then that the tachyon of the mother theory be projected out from the daughter theory, so that the original unstable vacuum is projected to a metastable vacuum. We study the circumstances under which this may happen and derive general constraints for metastability on the geometry and the gauging. We then study in full detail the simplest case of quaternionic manifolds of dimension four with at least one isometry, for which there exists a general parametrization, and study two types of truncations defining Kahler submanifolds of dimension two. As an application, we finally discuss the case of the universal hypermultiplet of N=2 superstrings and its truncations to the dilaton chiral multiplet of N=1 superstrings. We argue that de Sitter vacua in such theories are necessarily unstable in weakly coupled situations, while they can in principle be metastable in strongly coupled regimes. 000181866 6531_ $$aSupersymmetry Breaking 000181866 6531_ $$aExtended Supersymmetry 000181866 6531_ $$adS vacua in string theory 000181866 6531_ $$aSupergravity Models 000181866 700__ $$aCatino, Francesca 000181866 700__ $$0244581$$g181759$$aScrucca, Claudio A. 000181866 700__ $$aSmyth, Paul$$0245736$$g218010 000181866 773__ $$j2012$$tJournal of High Energy Physics$$k10$$q124 000181866 8564_ $$uhttps://infoscience.epfl.ch/record/181866/files/truncJHEPfinal.pdf$$zPreprint$$s336008$$yPreprint 000181866 909C0 $$xU11777$$0252314$$pGR-SC 000181866 909CO $$ooai:infoscience.tind.io:181866$$qGLOBAL_SET$$pSB$$particle 000181866 917Z8 $$x181759 000181866 937__ $$aEPFL-ARTICLE-181866 000181866 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL 000181866 980__ $$aARTICLE