Topic: 4D de Sitter from 6D gauged supergravity with Green-Schwarz counterterm
Speaker: Prof. Yi Pang
Coordinates: PCFT C1124, 16:00, Thursday, March 26
Abstract: String theory is the leading candidate for a theory of quantum gravity; however, classical de Sitter vacua within string theory remain elusive. We show that in a class of anomaly-free six-dimensional supergravity theories with local R-ymmetry, one can naturally obtain classical four- and six-dimensional vacuum solutions with a positive cosmological constant. This mechanism does not rely on nonperturbative effects or higher-order corrections, which are typically required in conventional string-theoretic constructions, and thus provides a new realization of de Sitter vacua within the low-energy effective theory of quantum gravity. In the final part of my talk, I will discuss the advantages and limitations of our model, as well as its possible extensions.