The momentum kernel of gauge and gravity theories
Abstract
We derive an explicit formula for factorizing an npoint closed string amplitude into open string amplitudes. Our results are phrased in terms of a momentum kernel which in the limit of infinite string tension reduces to the corresponding field theory kernel. The same momentum kernel encodes the monodromy relations which lead to the minimal basis of colorordered amplitudes in YangMills theory. There are interesting consequences of the momentum kernel pertaining to soft limits of amplitudes. We also comment on surprising links between gravity and certain combinations of kinematic and color factors in gauge theory.
 Publication:

Journal of High Energy Physics
 Pub Date:
 January 2011
 DOI:
 10.1007/JHEP01(2011)001
 arXiv:
 arXiv:1010.3933
 Bibcode:
 2011JHEP...01..001B
 Keywords:

 Supersymmetric gauge theory;
 Superstrings and Heterotic Strings;
 Models of Quantum Gravity;
 High Energy Physics  Theory
 EPrint:
 19 pages, 1 figure