Issues in IIA Uplifting Page: 2 of 8
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Models with all moduli stabilized in the massive type IIA string theory are relatively
simple: they engage all possible fluxes, no non-perturbative effects from the perspective of
the massive ten-dimensional type IIA supergravity are required [1, 2]. A model of particular
interest which we will study here, is the type IIA compactification on the T6/Z2 orientifold
studied in . It solves the equations of motion of the 10D type IIA massive supergravity
with account of local 06 and D6 sources and all possible fluxes. An interesting feature of
this model is that the stabilized moduli depend on a particular integer N related to certain
fluxes. N can be arbitrarily large, in contrast to other known models with stabilized
moduli where fluxes are bounded, see for example a review on this in . The action for
this model, as well as for more general models in this class, was constructed in . More
recently, various stringy aspects of this model were studied in .
The uplifting to dS vacua for these models have not been performed so far; neither
the analogs of the type IIB anti-D3 brane at the tip of the conifold nor the appropriate
D-terms have been identified. The recently improved version of the Kihler uplifting 
was not yet applied to the model in , so we have to wait before we know if it works.
On the other hand, recently there was a significant development with the F-term uplift-
ing in combining the KKLT model  with models which separately have non-supersymmetric
vacua with positive energy [8, 9, 10]. The fields in these models are expected to originate
from the open string sector in intersecting brane models, however, the details still have to
be worked out. If the uplifting model has small vev's comparative to Planckian scales, the
leading part of the F-term uplifting does not depend on the details of the added model. Per-
haps the simplest of these models is the O'KKLT model  combining the O'Raifeartaigh
model  with the Coleman-Weinberg corrections and the KKLT model.
The generic feature of F-term uplifting models is that
K=KA -KB , W =WAH+WB- (11)
Here the model A is gravitational and the model B is close to global susy: all dimensionful
quantities in model B are much smaller than the Planckian scale. In such case
Total ~ VA - eKA VB + ... (1.2)
The examples were proposed in [9, 10]. In string theory setting the fields in A originate
from the closed string sector and the fields in B originate from the open string sector.
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Kallosh, Renata & Soroush, Masoud. Issues in IIA Uplifting, report, December 12, 2006; [Menlo Park, California]. (https://digital.library.unt.edu/ark:/67531/metadc882163/m1/2/: accessed April 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.