The largest in the universe, the universe itself, and the smallest-elementary particles in the universe look very different and unrelated extremes. Modern cosmology and particle physics theory, however, show that they are actually closely related. In this talk I will describe what we understand about the smallest and the largest and how they are unified together. Several outstanding problems will also be discussed.

Professor Xiao-Gang He is a Tsung-Dao Lee professor and Chair Professor of Shanghai Jiao Tong University. He was a distinguished professor of Physics Department of Taiwan University and director of Taiwan Theoretical Science Center. A Fellow of the American Physical Society. His research interests include: Quantum topological phase, Electroweak and strong interactions, New physics beyond the standard model, and Cosmology.

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