Scattering Amplitudes meet Classical Gravity
演講者 : Wei-Ming Chen 陳韋名 JSPS Postdoctoral Fellow (Kobe University)
演講地點 : 理學教學新大樓物理系1F 36102教室
演講時間 : 2022 / 10 / 07 14:10
Undoubtedly, scattering processes play important role in our understanding of nature. At the most primitive level, we use our biological photon/phonon detector, our eyes/ears, to identify objects by observing the scattered light/sound. Along with the evolution of our technology, it allows us to probe more aspects of physics by shedding different types of waves/particles into the research targets. An important physical observable relevant to the cross-section of a scattering process is called scattering amplitude. In addition, scattering amplitude can be further utilized to study renormalization, spontaneous symmetry breaking, and so on. Studies based on scattering amplitudes have become popular in the past two decades due to the development of novel methods. In the talk, I will review the motivation as well as the idea of modern methods for the study of scattering amplitudes and the implication of the quest. On the other hand, the first detection of gravitational waves from binary black holes by LIGO and VIRGO has opened a new window for our understanding of gravity. To have gravitational-wave predictions of binary black-hole mergers, one needs to have an effective description of the potential between the binary system. I will connect the developed technology of scattering amplitudes to the study of binary black-hole mergers. Moreover, the application of the same methods to describe the Faraday rotation of the polarization of massless particles around a spinning black hole will also be presented.