11628 9 archive 1 disk0/00/01/16/28 2008-09-14 00:59:07 2008-09-14 00:59:07 2008-09-14 00:59:07 article show 0 Dimofte Tudor Dan Dimofte-T-D pub cls public dS vacua in string theory; Flux compactifications © SISSA 2008. Received 19 July 2008, accepted for publication 28 August 2008. Published 11 September 2008. It is a pleasure to thank H. Ooguri for inspiring and advising this project, as well as J. Conlon, F. Denef, M. Dine, S. Gukov, M. Johnson, J. Kumar, M. Larfors, J. Marsano, C. Melby-Thompson, F. Quevedo, K. Saraikin, N. Saulina, and S. Schafer-Nameki for many insightful discussions. The author would also like to thank IPMU, Tokyo, where part of this work was completed, for their great hospitality. This work was supported in part by DOE grant DE-FG02-92ER40701, the World Premier International Research Center Initiative of MEXT of Japan, and a National Defense Science and Engineering Graduate Fellowship. We study models of stabilization near large complex structure in type IIB O3/O7 flux compactifications. We consider a special family of examples with a single nonvanishing Yukawa coupling in the large-complex-structure limit, which allows us to study all possible stable vacua of the tree-level no-scale potential very explicitly. We find that, by tuning fluxes, both supersymmetric and nonsupersymmetric vacua can be realized at almost any point in the large-complex-structure moduli space of one-, two-, and three-parameter models. We also consider the effects of stringy corrections on tree-level vacua. We argue quite generally that, in certain regimes, both supersymmetric and nonsupersymmetric tree-level vacua could serve as consistent, controllable foundations for full stabilization beyond tree level (including Kähler moduli), leading to either AdS or dS cosmological constants. We show how to achieve these regimes in our models. 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