In this work, we investigate the bosonic chiral string in the sectorized interpretation, computing its spectrum, kinetic action and $3$-point amplitudes. As expected, the bosonic ambitwistor string is recovered in the tensionless limit. We also consider an extension of the bosonic model with current algebras. In that case, we compute the effective action and show that it is essentially the same as the action of the mass-deformed $(DF)^{2}$ theory found by Johansson and Nohle. Aspects which might seem somewhat contrived in the original construction --- such as the inclusion of a scalar transforming in some real representation of the gauge group --- are shown to follow very naturally from the worldsheet formulation of the theory.

中文翻译：

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玻色子扇区化弦和 (DF)2 理论

在这项工作中，我们研究了扇形解释中的玻色手征弦，计算了它的频谱、动力学作用和 $3$ 点振幅。正如预期的那样，玻色子 ambitwistor 弦恢复到无张力极限。我们还考虑了对当前代数的玻色模型的扩展。在这种情况下，我们计算有效作用并表明它与 Johansson 和 Nohle 发现的质量变形 $(DF)^{2}$ 理论的作用基本相同。在原始构造中可能看起来有些人为的方面——例如在规范群的某些实数表示中包含标量变换——显示出非常自然地遵循理论的世界表公式化。