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SUMMARY:De Sitter vacua in type IIB / F-theory by Kahler uplifting - Rumme
 l\, M (Universitt Hamburg)
DTSTART:20120626T140000Z
DTEND:20120626T141500Z
UID:TALK38660@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:We derive a sufficient condition and present explicit examples
  based on toric geometry for realizing meta-stable de Sitter vacua with sm
 all positive cosmological constant within type IIB string theory / F-theor
 y flux compactifications with spontaneously broken supersymmetry. There ar
 e a number of `lamp post' constructions of de Sitter vacua in type IIB str
 ing theory and supergravity. We show that one of them -- the method of `K"
 ahler uplifting' by F-terms from an interplay between non-perturbative eff
 ects and the leading $lpha'$-correction -- allows for a more general para
 metric understanding of the existence of de Sitter vacua. The result is a 
 condition on the values of the flux induced superpotential and the topolog
 ical data of the Calabi-Yau compactification\, which guarantees the existe
 nce of a meta-stable de Sitter vacuum if met. Our analysis explicitly incl
 udes the stabilization of all moduli\, i.e. the K"ahler\, dilaton and comp
 lex structure modu li\, by the interplay of the leading perturbative and n
 on-perturbative effects at parametrically large volume.\n
LOCATION:Seminar Room 2\, Newton Institute Gatehouse
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