On NS-NS couplings at order ${\alpha }^{\prime 3}$

Abstract

Recently, imposing the gauge-symmetry and the T-duality constraints on the string frame effective actions of type II superstring theories, the NS-NS cuplings have been found in a particular scheme which has 445 couplings in 15 different structures. In this paper, using a field redefinition, we write them in terms of 251 couplings which appear in 9 different structures. The 9 structures involve only Riemann curvature, $H_{\alpha \beta \mu }$ and ${\nabla }_{\alpha }{H}_{\beta \mu \nu }$. The number of couplings in the structures $R^4$, $H^8$, $H^{6}R$, $H^4{R}^2$, $H^2{R}^3$ are $2,2,1,7,22$, respectively, and the number of couplings in the structures $(\nabla H{)}^4$, $(\nabla H{)}^2{R}^2$, $(\nabla H{)}^2{H}^4$, $(\nabla H{)}^2{H}^{2}R$ are $12,22,77,106$, respectively. The new couplings are fully consistent with the sphere-level S-matrix element of four NS-NS vertex operators.

arXiv comment15 pages, Latex file, no figure. arXiv admin note: text overlap with arXiv:2006.09193; v2: the version appears in NPB

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• Effective action of string theory at order ${\alpha }^{\prime }$ in the presence of boundary
• Couplings of order six in the gauge field strength and the second fundamental form on a D${}_p$-brane at order ${\alpha }^{\prime 2}$
• T-duality building blocks for ${\alpha }^{\prime }$ string corrections
• Minimal gauge invariant couplings at order ${\ell }_p^6$ in M-theory
• Type IIB at eight derivatives: insights from Superstrings, Superfields and Superparticles