Public Research Seminar by Advanced Materials Thrust, Function Hub, HKUST(GZ) - The holographic universe

In this talk, I will first introduce the idea of holography and AdS/CFT. Although AdS/CFT has encountered tremendous success in the last decades, inflation and the present dark energy dominated universe is approximated as a de Sitter space. This motivates us to consider holography and dS/CFT. Then I will describe two aspects of how can it be related to cosmology. First of all, since in AdS/CFT, exact string solutions in AdS is important to understand the physics in the bulk spacetime, this motivates us to study several exact string solutions in de Sitter space. I will describe the string solutions we have found and how they are different from the classical string solutions in the AdS spacetime. Second, inflation can be described as a deformed CFT on the boundary. I will discuss the connection between the holographic non-Gaussianities and how it can be connected to the symmetries of CFT. In the end, I will talk about the idea that spacetime can emerge from quantum entanglement and possible implications to holographic cosmology.