All-Helicity Symbol Alphabets from Unwound Amplituhedra
High Energy Physics - Theory
2018-07-04 v2
Abstract
We review an algorithm for determining the branch points of general amplitudes in planar super-Yang-Mills theory from amplituhedra. We demonstrate how to use the recent reformulation of amplituhedra in terms of `sign flips' in order to streamline the application of this algorithm to amplitudes of any helicity. In this way we recover the known branch points of all one-loop amplitudes, and we find an `emergent positivity' on boundaries of amplituhedra.
Keywords
Cite
@article{arxiv.1711.11507,
title = {All-Helicity Symbol Alphabets from Unwound Amplituhedra},
author = {Igor Prlina and Marcus Spradlin and James Stankowicz and Stefan Stanojevic and Anastasia Volovich},
journal= {arXiv preprint arXiv:1711.11507},
year = {2018}
}
Comments
38 pages, 5 figures, 1 big table; v2: minor corrections and improvements