The momentum kernel of gauge and gravity theories

  • N. E. J. Bjerrum-Bohr
  • Poul H. Damgaard
  • Thomas Søndergaard
  • Pierre Vanhove
Open Access


We derive an explicit formula for factorizing an n-point 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 color-ordered amplitudes in Yang-Mills 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.


Supersymmetric gauge theory Superstrings and Heterotic Strings Models of Quantum Gravity 


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© The Author(s) 2011

Open Access This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

Authors and Affiliations

  • N. E. J. Bjerrum-Bohr
    • 1
  • Poul H. Damgaard
    • 1
  • Thomas Søndergaard
    • 1
  • Pierre Vanhove
    • 2
  1. 1.Niels Bohr International Academy and Discovery CenterThe Niels Bohr InstituteCopenhagen ØDenmark
  2. 2.CEA, DSM, Institut de Physique Théorique, IPhT, CNRS, MPPUGif-sur-YvetteFrance

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