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We compute one-loop threshold corrections to ℛ4 terms in N=5,6 supergravity vacua of Type II superstrings. We then discuss nonperturbative corrections generated by asymmetric D-brane instantons. Finally we derive generating functions for MHV amplitudes at tree level in N=5,6 supergravities

advances in high energy physics

On<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msup><mml:mi>ℛ</mml:mi><mml:mn>4</mml:mn></mml:msup></mml:mrow></mml:math>Terms and MHV Amplitudes in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi mathvariant="script">N</mml:mi><mml:mo>=</mml:mo><mml:mn>5,6</mml:mn></mml:math>Supergravity Vacua of Type II Superstrings

Onℛ4Terms and MHV Amplitudes inN=5,6Supergravity Vacua of Type II Superstrings