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He, S; Zhang, C
Notes on scattering amplitudes as differential forms
AbstractInspired by the idea of viewing amplitudes in N = 4 SYM as differential forms on momentum twistor space, we introduce differential forms on the space of spinor variables, which combine helicity amplitudes in any four-dimensional gauge theory as a single object. In this note we focus on such differential forms in N = 4 SYM, which can also be thought of as "bosonizing" superamplitudes in non-chiral superspace. Remarkably all tree-level amplitudes in N = 4 SYM combine to a d log form in spinor variables, which is given by push forward of canonical forms of Grassmannian cells. The tree forms can also be obtained using BCFW or inverse-soft construction, and we present all-multiplicity expression for MHV and NMHV forms to illustrate their simplicity. Similarly all-loop planar integrands can be naturally written as d log forms in the Grassmannian/on-shell-diagram picture, and we expect the same to hold beyond the planar limit. Just as the form in momentum twistor space reveals underlying positive geometry of the amplituhedron, the form in terms of spinor variables strongly suggests an "amplituhedron in momentum space". We initiate the study of its geometry by connecting it to the moduli space of Witten's twistor-string theory, which provides a push forward formula for tree forms in N = 4 SYM.
Subject AreaPhysics
MOST Discipline CataloguePhysics, Particles & Fields
Indexed BySCIE
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Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
AffiliationChinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, 55 Zhong Guan Cun East St, Beijing 100190, Peoples R China; Univ Chinese Acad Sci, Sch Phys Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
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He, S,Zhang, C. Notes on scattering amplitudes as differential forms[J]. JOURNAL OF HIGH ENERGY PHYSICS,2018(10):54.
APA He, S,&Zhang, C.(2018).Notes on scattering amplitudes as differential forms.JOURNAL OF HIGH ENERGY PHYSICS(10),54.
MLA He, S,et al."Notes on scattering amplitudes as differential forms".JOURNAL OF HIGH ENERGY PHYSICS .10(2018):54.
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