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PKU HEP Seminar and Workshop (北京大学高能物理组)

Scattering Amplitudes in AdS

by Prof. Xinan Zhou (University of Chinese Academy of Sciences)



Scattering amplitudes are important physical quantities which encode the microscopic details of interactions. In this talk, we focus on scattering amplitudes in anti de Sitter (AdS) space. These objects are basic observables for testing and exploiting the AdS/CFT correspondence, allowing us to analytically study the physics at strong coupling. They also help to sharpen our understanding of Quantum Field Theory and gravity, in particular by comparing with flat-space amplitudes where recent progress has generated a lot of new lessons. I will review the basics of scattering amplitudes in AdS, and the enormous difficulties associated with the standard diagrammatic expansion method. I will then explain how the use of 'bootstrap' ideas greatly simplifies the problem, and allows us to reveal the remarkable underlying simplicity in these objects. I'll present explicit results in several important theories, involving gluons and gravitons in AdS, and show that they enjoy similar relations reminiscent of the flat-space case. I will also point out other interesting properties which are intrinsic to curved backgrounds. The physical origins of these features so far have not been identified, and might lead to new understanding for theories in AdS.    Introduction of the speaker: 2021-now: Assistant Professor, Kavli Institute for Theoretical Sciences, UCAS. 2018-2021: Postdoctoral Fellow, Princeton Center for Theoretical Science (PCTS), Princeton University. 2013-2018: Ph.D. in Physics, C. N. Yang Institute for Theoretical Physics (YITP), Stony Brook University. 2009-2013: B.Sc in Physics, University of Science and Technology of China,   Tecent Meeting: https://meeting.tencent.com/dm/obSQMNwJ9IKr Meeting ID:924 376 217