Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1996-05-23
Phys.Lett. B384 (1996) 103-110
Physics
High Energy Physics
High Energy Physics - Theory
10 pages, plain LaTeX. Some references added and eq.(35) simplified
Scientific paper
10.1016/0370-2693(96)00821-0
We show that the usual dilaton dominance scenario, derived from the tree level K\"ahler potential, can never correspond to a global minimum of the potential at $V=0$. Similarly, it cannot correspond to a local minimum either, unless a really big conspiracy of different contributions to the superpotential $W(S)$ takes place. These results, plus the fact that the K\"ahler potential is likely to receive sizeable string non-perturbative contributions, strongly suggest to consider a more general scenario, leaving the K\"ahler potential arbitrary. In this way we obtain generalized expressions for the soft breaking terms but a predictive scenario still arises. Finally, we explore the phenomenological capability of some theoretically motivated forms for non-perturbative K\"ahler potentials, showing that it is easy to stabilize the dilaton at the realistic value $S\sim 2$ with just one condensate and no fine-tuning.
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