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Final Defense: Prescriptive Unitarity in non-planer theory and Tree level double copy by recursion relations
Add to Calendar 2024-02-21T22:00:00 2024-02-22T00:00:00 UTC Final Defense: Prescriptive Unitarity in non-planer theory and Tree level double copy by recursion relations 320 Whitmore Laboratory and https://psu.zoom.us/my/yaqi29
Start DateWed, Feb 21, 2024
5:00 PM
to
End DateWed, Feb 21, 2024
7:00 PM
Presented By
Yaqi Zhang, The Pennsylvania State University

We construct all NkMHV six-particle amplitude integrands in color-dressed, maximally supersymmetric Yang-Mills theory at two loops in a single prescriptive basis of master integrands. We outline the concrete steps involved in building prescriptive master integrand bases for scattering amplitudes beyond the planar limit. We highlight the role of contour choices in such bases, and illustrate the full process by constructing a complete, triangle power-counting basis at two loops for six particles. We show how collinear contour choices can be used to divide integrand bases into separately finite and divergent subspaces, and how double-poles can be used to further subdivide these spaces according to (transcendental) weight. We prove that all tree-level amplitudes in pure (super-)gravity can be expressed as term-wise, gauge-invariant double-copies of those of pure (super-)Yang-Mills obtained via BCFW recursion. These representations are far from unique: varying the recursive scheme leads to a wide variety of distinct, but equally valid representations of gravitational amplitudes, all realized as double-copies.

Event Series: Final Defense