S-duality Improved Superstring Perturbation Theory

Abstract

Strong - weak coupling duality in string theory allows us to compute physical quantities both at the weak coupling end and at the strong coupling end. Furthermore perturbative string theory can be used to compute corrections to the leading order formula at both ends. We explore the possibility of constructing a smooth interpolating formula that agrees with the perturbation expansion at both ends and leads to a fairly accurate determination of the quantity in consideration over the entire range of the coupling constant. We apply this to study the mass of the stable non-BPS state in SO(32) heterotic / type I string theory with encouraging results. In particular our result suggests that after taking into account one loop corrections to the mass in the heterotic and type I string theory, the interpolating function determines the mass within 10% accuracy over the entire range of coupling constant.

LaTex file, 27 pages, 7 figures; v2: minor additions; v3: added comparison with other interpolation methods

References in corpus (2)

• Superstring Perturbation Theory Revisited
• High and Low Dimensions in The Black Hole Negative Mode

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