TY - EJOUR
DO - 10.1007/JHEP10(2012)124
AB - We 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.
T1 - Metastable de Sitter vacua in N=2 to N=1 truncated supergravity
IS - 10
DA - 2012
AU - Catino, Francesca
AU - Scrucca, Claudio A.
AU - Smyth, Paul
JF - Journal of High Energy Physics
SP - 124
VL - 2012
EP - 124
PB - Springer
PP - New York
ID - 181866
KW - Supersymmetry Breaking
KW - Extended Supersymmetry
KW - dS vacua in string theory
KW - Supergravity Models
SN - 1126-6708
UR - http://infoscience.epfl.ch/record/181866/files/truncJHEPfinal.pdf
ER -