|Scattering Amplitudes and Mathematical Structures|
|Time：||16:30-17:30, 2015-12-4 (Fri.)|
|Instructor：||Song He [Institute of Theoretical Physics, CAS]|
|Place：||Lecture hall, Floor 3, Jin Chun Yuan West Building|
The traditional method for computing scattering amplitudes in QFT involves summing over Feynman diagrams. It has become clear, however, amplitudes in gauge theories and gravity have remarkable simplicity and structure, which are completely invisible from the textbook method. In recent years, physicists have discovered various new formulations for amplitudes based on some intriguing mathematical structures, such as the Grassmannian, a geometric object called “amplituhedron”, and punctured Riemann spheres. I will give a general review and discuss some of them.