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Abstract: We perform a general analysis on the possibility of obtaining metastablevacua with spontaneously broken N=1 supersymmetry and non-negative cosmologicalconstant in the moduli sector of string models. More specifically, we study thecondition under which the scalar partners of the Goldstino are non-tachyonic,which depends only on the Kahler potential. This condition is not onlynecessary but also sufficient, in the sense that all of the other scalar fieldscan be given arbitrarily large positive square masses if the superpotential issuitably tuned. We consider both heterotic and orientifold stringcompactifications in the large-volume limit and show that the no-scale propertyshared by these models severely restricts the allowed values for the`sGoldstino- masses in the superpotential parameter space. We find that apositive mass term may be achieved only for certain types of compactificationsand specific Goldstino directions. Additionally, we show how subleadingcorrections to the Kahler potential which break the no-scale property may allowto lift these masses.



Autor: Laura Covi, Marta Gomez-Reino, Christian Gross, Jan Louis, Gonzalo A. Palma, Claudio A. Scrucca

Fuente: https://arxiv.org/







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