Abstract

The ΛCDM model provides the standard description of our Universe, yet the origin of the cosmological constant remains unresolved. The speaker will show that in a class of anomaly-free six-dimensional supergravity theories with local R-symmetry, 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.


About the Speaker

Dr. PANG Yi received his PhD from the Institute of Theoretical Physics, Chinese Academy of Science in 2011. He subsequently held positions as a Research Assistant at Texas A&M University, a Humboldt Fellow at the Max Planck Institute for Gravitational Physics, and a Royal Society Newton Fellow affiliated with the University of Oxford. In 2020, he joined Tianjin University as a Professor.


About the Center for Fundamental Physics

For more information, please refer to https://cfp.hkust.edu.hk/.


For Attendees' Attention

Seating is on a first come, first served basis.