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# Seminar

## Exponentially suppressed cosmological constant with enhanced gauge symmetry in heterotic interpolating models (in English)

• SPEAKER: Mr. Sota Nakajima
( Osaka City University )
• DATE: July 16 (Tue) 11:00-12:00
• PLACE: Meeting Room 1, 1st Floor, Kenkyu-Honkan

An interpolating model is a (D－ d)-dimensional string model that continuously relates two D-dimensional string models. A few nine-dimensional interpolating models with two parameters are constructed and the massless spectra are studied by considering compactification of heterotic strings on a twisted circle with Wilson line. It is found that there are some conditions between radius R and Wilson line A under which the gauge symmetry is enhanced. In particular, when the gauge symmetry is enhanced to SO(18) \times SO(14), the cosmological constant is exponentially suppressed. We also construct a non-supersymmetric string model which is tachyon-free in all regions of moduli space and whose gauge symmetry involves E_8. This talk will be based on the work with H. Itoyama, arXiv: 1905.10745.