Explicit Cancellation of Triangles in One-loop Gravity Amplitudes

Understand

We analyse one-loop graviton amplitudes in the field theory limit of a genus-one string theory computation.

• The considered amplitudes can be dimensionally reduced to lower dimensions preserving maximal supersymmetry.
• The particular case of the one-loop five-graviton amplitude is worked out in detail and explicitly features no triangle contributions.
• Based on a recursive form of the one-loop amplitude we investigate the contributions that will occur at n-point order in relation to the ``no-triangle'' hypothesis of N=8 supergravity.