Low energy expansion of the four-particle genus-one amplitude in type II superstring theory

Details Low energy expansion of the four-particle genus-one amplitude in type II superstring theory Low energy expansion of the four-particle genus-one amplitude in type II superstring theory

2008-01-02

arxiv.org/abs/0801.0322v1

JHEP 0802:020,2008

Physics

High Energy Physics

High Energy Physics - Theory

JHEP style. 6 eps figures. 50 pages

Scientific paper

10.1088/1126-6708/2008/02/020

A diagrammatic expansion of coefficients in the low-momentum expansion of the genus-one four-particle amplitude in type II superstring theory is developed. This is applied to determine coefficients up to order s^6R^4 (where s is a Mandelstam invariant and R^4 the linearized super-curvature), and partial results are obtained beyond that order. This involves integrating powers of the scalar propagator on a toroidal world-sheet, as well as integrating over the modulus of the torus. At any given order in s the coefficients of these terms are given by rational numbers multiplying multiple zeta values (or Euler--Zagier sums) that, up to the order studied here, reduce to products of Riemann zeta values. We are careful to disentangle the analytic pieces from logarithmic threshold terms, which involves a discussion of the conditions imposed by unitarity. We further consider the compactification of the amplitude on a circle of radius r, which results in a plethora of terms that are power-behaved in r. These coefficients provide boundary `data' that must be matched by any non-perturbative expression for the low-energy expansion of the four-graviton amplitude. The paper includes an appendix by Don Zagier.

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