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This lecture, part of the "Positive Geometry in Scattering Amplitudes and Cosmological Correlators" program at the International Centre for Theoretical Sciences, explores recent developments in the field of amplitudes and correlators presented by Song He. Delve into the intersection of mathematical aspects of scattering amplitudes and cosmology during this 73-minute presentation. Learn about the tremendous insights gained in perturbative on-shell scattering amplitudes over recent decades, including unitarity methods, recursion relations, worldsheet models, bootstrap methods, and connections to positive geometry, positive Grassmannian, Associahedron, and the Amplituhedron. Discover how similar remarkable structures have been observed in cosmological correlators, which capture fundamental physics of our Universe, creating connections between seemingly different fields of theoretical physics. The lecture is part of a workshop organized by Nima Arkani-Hamed, Johannes Henn, Suvrat Raju, and Jaroslav Trnka, aimed at advancing these connections further.
