论文标题
D-Instanton扰动理论
D-instanton Perturbation Theory
论文作者
论文摘要
D-Instanton世界体积理论具有开放的弦零模式，描述了Instanton的集体坐标。由于存在这些零模式，D-Instanton背景中通常的扰动振幅遭受了红外差异的影响，并且Momenta中的分析延续的通常方法不起作用，因为D-Instanton上的所有开放式弦状态都严格零动量。弦场理论非常适合解决这些问题。但是，由于幽灵部门中存在其他零模式，我们发现了一个新的微妙之处。这会导致Siegel仪表的分解，但是与BV形式主义一致的不同规格固定使扰动理论有限且明确。在每个顺序上，除了从Riemann表面的模量空间中获得的集成获得的幅度外，这都会对振幅产生额外的贡献。
D-instanton world-volume theory has open string zero modes describing collective coordinates of the instanton. The usual perturbative amplitudes in the D-instanton background suffer from infra-red divergences due to the presence of these zero modes, and the usual approach of analytic continuation in momenta does not work since all open string states on a D-instanton carry strictly zero momentum. String field theory is well-suited for tackling these issues. However we find a new subtlety due to the existence of additional zero modes in the ghost sector. This causes a breakdown of the Siegel gauge, but a different gauge fixing consistent with the BV formalism renders the perturbation theory finite and unambiguous. At each order, this produces extra contribution to the amplitude besides what is obtained from integration over the moduli space of Riemann surfaces.
