Scholarlink

<p>In this work, we derive the classical effective action of bosonic string theory at order <i>α</i><sup>′3</sup> 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 <i>α</i><sup>′</sup> 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 <i>α</i><sup>′</sup> and a single remaining parameter. This final parameter is determined by matching the single-trace term Tr(<i>ϵϵϵϵ</i>) 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.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effective action of bosonic string theory at order α′3

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年12月17日

查看全文
  • Mehdi Ameri,
  • Alireza Pahlavan,
  • Mohammad R. Garousi

摘要

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.