Matching the $D^6{\mathcal{R}}^4$ interaction at two-loops

Abstract

The coefficient of the $D^6{\mathcal{R}}^4$ interaction in the low energy expansion of the two-loop four-graviton amplitude in type II superstring theory is known to be proportional to the integral of the Zhang-Kawazumi (ZK) invariant over the moduli space of genus-two Riemann surfaces. We demonstrate that the ZK invariant is an eigenfunction with eigenvalue 5 of the Laplace-Beltrami operator in the interior of moduli space. Exploiting this result, we evaluate the integral of the ZK invariant explicitly, finding agreement with the value of the two-loop $D^6{\mathcal{R}}^4$ interaction predicted on the basis of S-duality and supersymmetry. A review of the current understanding of the $D^{2p}{\mathcal{R}}^4$ interactions in type II superstring theory compactified on a torus $T^d$ with $p\le 3$ and $d\le 4$ is included.

arXiv comment40 pages, various typos and coefficients corrected in version 2

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Cited by in corpus (61)

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