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arXiv · 2105.07598

$O(9,9)$ symmetry of NS-NS couplings at order $α'^3$

Mohammad R. Garousi
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Abstract

Recently, imposing the $O(1,1)$ symmetry on the circle reduction of the classical effective action of string theory, we have found all NS-NS couplings of type II superstring theories at order $α'^3$. In this paper we use the cosmological reduction on the couplings and show that, up to field redefinitions and total derivative terms, they are invariant under the $O(9,9)$ transformations.

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Mohammad R. Garousi. 2021-05-17. $O(9,9)$ symmetry of NS-NS couplings at order $α'^3$. https://doi.org/10.1103/physrevd.104.066013

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