Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2007-02-03
JHEP 0705:085,2007
Physics
High Energy Physics
High Energy Physics - Theory
10 pages, 2 figures, plain Latex, references added
Scientific paper
10.1088/1126-6708/2007/05/085
The issue of fine-tuning necessary to achieve satisfactory degree of hierarchy between moduli masses, the gravitino mass and the scale of the cosmological constant has been revisited in the context of supergravities with consistent D-terms. We have studied (extended) racetrack models where supersymmetry breaking and moduli stabilisation cannot be separated from each other. We show that even in such cases the realistic hierarchy can be achieved on the expense of a single fine-tuning. The presence of two condensates changes the role of the constant term in the superpotential, W_0, and solutions with small vacuum energy and large gravitino mass can be found even for very small values of W_0. Models where D-terms are allowed to vanish at finite vevs of moduli fields - denoted `cancellable' D-terms - and the ones where D-terms may vanish only at infinite vevs of some moduli - denoted `non-cancellable' - differ markedly in their properties. It turns out that the tuning with respect to the Planck scale required in the case of cancellable D-terms is much weaker than in the case of non-cancellable ones. We have shown that, against intuition, a vanishing D-term can trigger F-term uplifting of the vacuum energy due to the stringent constraint it imposes on vacuum expectation values of charged fields. Finally we note that our models only rely on two dimensionful parameters: M_P and W_0.
Eyton-Williams Oliver J.
Lalak Zygmunt
Matyszkiewicz Radoslaw
No associations
LandOfFree
F-term uplifting via consistent D-terms does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with F-term uplifting via consistent D-terms, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and F-term uplifting via consistent D-terms will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-496687