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arXiv · 2506.19471

Effective action of bosonic string theory at order $α'^3$

Mehdi Ameri·Alireza Pahlavan·Mohammad R. Garousi
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Abstract

In this work, we derive the classical effective action of bosonic string theory at order $α'^{3}$ for the metric, Kalb-Ramond field, and dilaton by imposing a higher-derivative extension of the Buscher rules on the circular reduction of the minimal basis at this order, in the schemes where their corresponding actions at order $α'$ are the Meissner and the Metsaev-Tseytlin schemes. We find that T-duality fixes all coupling constants in terms of the known overall factor at order $α'$ and a single remaining parameter. This final parameter is determined by matching the single-trace term $\Tr(εεεε)$ in the four-graviton S-matrix element which lacks a massless pole, with the corresponding string theory amplitude. Our results for the Riemann quartic terms are in full agreement with those obtained from the nonlinear sigma-model approach.

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Mehdi Ameri, Alireza Pahlavan, Mohammad R. Garousi. 2025-11-16. Effective action of bosonic string theory at order $α'^3$. https://arxiv.org/abs/2506.19471

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