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Rankin-Selberg methods for closed string amplitudes

Abstract : After integrating over supermoduli and vertex operator positions, scattering amplitudes in superstring theory at genus $h\leq 3$ are reduced to an integral of a Siegel modular function of degree $h$ on a fundamental domain of the Siegel upper half plane. A direct computation is in general unwieldy, but becomes feasible if the integrand can be expressed as a sum over images under a suitable subgroup of the Siegel modular group: if so, the integration domain can be extended to a simpler domain at the expense of keeping a single term in each orbit -- a technique known as the Rankin-Selberg method. Motivated by applications to BPS-saturated amplitudes, Angelantonj, Florakis and I have applied this technique to one-loop modular integrals where the integrand is the product of a Siegel-Narain theta function times a weakly, almost holomorphic modular form. I survey our main results, and take some steps in extending this method to genus greater than one.
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Contributor : Boris Pioline Connect in order to contact the contributor
Submitted on : Monday, January 20, 2014 - 9:06:20 PM
Last modification on : Saturday, December 4, 2021 - 4:07:43 AM

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Boris Pioline. Rankin-Selberg methods for closed string amplitudes. Proceedings of Symposia in Pure Mathematics, 2014, 88, pp.119. ⟨10.1090/pspum/088/01457⟩. ⟨hal-00933686⟩



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