Theory Seminar

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
(in English)
SPEAKER 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



    ABSTRACT

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.