KEK 素粒子原子核研究所 理論セミナー
|TITLE：||Comments on Stability for de Sitter Vacua in String Theory|
Dr. Yoske Sumitomo
(Hong Kong University of Science and Technology)
|DATE：||December 20 (Tue.) 16:00 − 17:00|
|PLACE:||Kenkyu Honkan 1F, Meeting Room 1|
We analyze a property of mass matrix at positive extrema in type II string theory. In IIA, off-diagonal components are not suppressed, therefore tachyonic directions are likely met in the presence of many moduli. While in a IIB model, such the suppression is achieved due to a hierarchy by non-perturbative effect and an alpha' correction. Many moduli may help to realize small cosmological constant in the model.