Loops of Loops Expansion in the Amplituhedron
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| Format: | Preprint |
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2023
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| _version_ | 1866929195188224000 |
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| author | Brown, Taro V. Oktem, Umut Paranjape, Shruti Trnka, Jaroslav |
| author_facet | Brown, Taro V. Oktem, Umut Paranjape, Shruti Trnka, Jaroslav |
| contents | We study a novel geometric expansion for scattering amplitudes in the planar sector of N=4 super Yang-Mills theory, in the context of the Amplituhedron which reproduces the all-loop integrand as a canonical differential form on the positive geometry. In a paper by Arkani-Hamed, Henn and one of the authors, it was shown that this result can be recast in terms of negative geometries with a certain hierarchy of loops (closed cycles) in the space of loop momenta, represented by lines in momentum twistor space. One can then calculate an all-loop order result in the approximation where only tree graphs in the space of all loops are considered. Furthermore, using differential equation methods, it is possible to calculate and resum integrated expressions and obtain strong coupling results. In this paper, we provide a more general framework for the loops of loops expansion and outline a powerful method for the determination of differential forms for higher-order geometries. We solve the problem completely for graphs with one internal cycle, but the method can be used more generally for other geometries. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2312_17736 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Loops of Loops Expansion in the Amplituhedron Brown, Taro V. Oktem, Umut Paranjape, Shruti Trnka, Jaroslav High Energy Physics - Theory We study a novel geometric expansion for scattering amplitudes in the planar sector of N=4 super Yang-Mills theory, in the context of the Amplituhedron which reproduces the all-loop integrand as a canonical differential form on the positive geometry. In a paper by Arkani-Hamed, Henn and one of the authors, it was shown that this result can be recast in terms of negative geometries with a certain hierarchy of loops (closed cycles) in the space of loop momenta, represented by lines in momentum twistor space. One can then calculate an all-loop order result in the approximation where only tree graphs in the space of all loops are considered. Furthermore, using differential equation methods, it is possible to calculate and resum integrated expressions and obtain strong coupling results. In this paper, we provide a more general framework for the loops of loops expansion and outline a powerful method for the determination of differential forms for higher-order geometries. We solve the problem completely for graphs with one internal cycle, but the method can be used more generally for other geometries. |
| title | Loops of Loops Expansion in the Amplituhedron |
| topic | High Energy Physics - Theory |
| url | https://arxiv.org/abs/2312.17736 |