Sign Flip Triangulation of the Amplituhedron Ryota Kojima SOKENDAI, KEK theory centor Based on RK, JHEP 1904 (2019) 085 arxiv:1812.01822 [hep-th] RK, Cameron Langer, Jaroslav Trnka and Minshan Zheng(UC Davis, QMAP), in progress Strings and Fields 2019 at YITP 8/20
Introduction structure of scattering amplitude. in theoretical physics. 2 • Scattering amplitude: Basic objects in QFT. • Recently there are many progress about the understanding of the new • Studying and calculating scattering amplitudes became a new direction • Major motivations: • Efficient calculations of the scattering amplitudes • Use amplitudes as a probe to explore quantum field theory
Introduction (Arkani-Hamed, Bourjaily, Cachazo, Caron-Huot, Trnka 2010) 3 2485 34300 6 220 <latexit sha1_base64="UNc4SGyPxwXJet7OEnzpsxTFaM=">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</latexit> <latexit sha1_base64="UNc4SGyPxwXJet7OEnzpsxTFaM=">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</latexit> <latexit sha1_base64="UNc4SGyPxwXJet7OEnzpsxTFaM=">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</latexit> <latexit sha1_base64="UNc4SGyPxwXJet7OEnzpsxTFaM=">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</latexit> BCFW Feynman diagrams (Britto, Cachazo, Feng, Witten 2005) 3 from BCFW. 20 • Efficient calculations of the scattering amplitudes • Use amplitudes as a probe to explore quantum field theory • Example: BCFW recursion relation • Method for building higher-point amplitudes from lower-point g + g → 4 g, g + g → 5 g, g + g → 6 g • It is possible to calculate all order amplitudes in Planar N=4 SYM
4 (N. Arkani-Hamed, J. Trnka 2013) Introduction “Amplitude = Volume of a geometric object” Example; Planar N=4 SYM The amplituhedron • k-plane in k+m dimensional space • Defined as a generalization of convex polytope. • m=4 ; physical amplituhedron <latexit sha1_base64="rtbfKwWuf3iK8FfI4E6z8Bd1xAI=">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</latexit> <latexit sha1_base64="rtbfKwWuf3iK8FfI4E6z8Bd1xAI=">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</latexit> <latexit sha1_base64="rtbfKwWuf3iK8FfI4E6z8Bd1xAI=">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</latexit> <latexit sha1_base64="rtbfKwWuf3iK8FfI4E6z8Bd1xAI=">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</latexit> • Efficient calculations of the scattering amplitudes • Use amplitudes as a probe to explore quantum field theory • Geometrization of scattering amplitudes A n,m,k ( Z ) Z 1 Z 2 Z n Z 4 A n,k ( Z ) Z 3
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