We study semiclassical spiky strings in de Sitter space and the corresponding Regge trajectories, generalizing the analysis in anti-de Sitter space. In particular we demonstrate that each Regge trajectory has a maximum spin due to de Sitter acceleration, similarly to the folded string studied earlier. While this property is useful for the spectrum to satisfy the Higuchi bound, it makes a nontrivial question how to maintain mildness of high-energy string scattering which we are familiar with in flat space and anti-de Sitter space. Our analysis implies that in order to have infinitely many higher spin states, one needs to consider infinitely many Regge trajectories with an increasing folding number.

我们研究了de Sitter空间中的半经典尖峰字符串以及相应的Regge轨迹，从而对anti-de Sitter空间中的分析进行了概括。特别是，我们证明了每个Regge轨迹由于de Sitter加速度而具有最大自旋，这与之前研究的折叠弦相似。虽然此属性对于满足Higuchi界的光谱很有用，但它提出了一个重要的问题，即如何在平坦空间和anti-de Sitter空间中保持我们熟悉的高能弦散射的温和性。我们的分析表明，为了拥有无限多个更高的自旋状态，需要考虑无限多折叠数不断增加的Regge轨迹。