BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Athanasia-Konstantina Angelopoulou (Trinity College\, Dublin) DTSTART:20261020T090000Z DTEND:20261020T100000Z DTSTAMP:20261026T134514Z UID:NKUA-HEP/60 DESCRIPTION:Title: Amplitudes in N=4 SYM -- Simplicity and structure in symbols\nby Ath anasia-Konstantina Angelopoulou (Trinity College\, Dublin) as part of NKUA HEP Seminars\n\n\nAbstract\nScattering amplitudes are central to understa nding particle interactions in quantum field theory\, serving as a bridge between theoretical predictions and experimental observations. In this tal k\, I will first introduce modern approaches to computing scattering ampli tudes that go beyond traditional Feynman-diagram techniques\, such as on-s hell recursion relations and unitarity-based methods. These methods reveal a remarkable simplicity in the analytic structure of amplitudes\, made ma nifest by the symbol. I will then turn to planar N=4 super Yang–Mills th eory\, which provides an ideal setting to explore the connections between generalized unitarity\, Landau analysis and cluster algebras. In dimension al regularization\, the symbol of the one-loop amplitude decomposes into a part controlled by maximal cuts\, where Landau singularities of nested cu ts order the symbol entries\, and a residual sector. Cancellations of lett ers from individual box integrals are explained by the two-mass triangle r elations among box coefficients. Finally\, I will discuss the cluster-alge braic properties of the amplitude. This talk is based on arXiv:2609.05716 with R. Britto and M. Parisi.\n\nIn person only.\n LOCATION:https://researchseminars.org/talk/NKUA-HEP/60/ END:VEVENT END:VCALENDAR