COLLOQUIUM:- Topological Quantum Field Theory in 3+1D and the Emergence of Quantum Gravity
Topological quantum field theory(TQFT) is a very powerful theoretical tool to study topological phases and phase transitions. In 2+1D, it is well known that the Chern-Simons theory captures all the universal topological data of topological phases, e.g., quasi-particle braiding statistics, chiral central charge and even provides us a deep insight for the nature of topological phase transitions. Recently, topological phases of quantum matter are also intensively studied in 3+1D and it has been shown that loop like excitation obeys the so-called three-loop-braiding statistics. In this talk, the speaker will discuss a TQFT framework to understand the quantum statistics of loop like excitation in 3+1D. Most surprisingly, this new class of 3+1D TQFT even provides us a new route towards a quantum theory of gravity.
講者：顧正澄 教授 Prof. Zhengcheng GU(香港中文大學物理系)