Exploring fundamental degrees of freedom of string theory using string field theory

利用边界共形场理论中的边界条件变换算子构造了开放弦场论的解析解，并将其推广到开放超弦场论。虽然我们的构造仅限于边界条件变化的算子满足某些正则性条件的情况，但对于不同背景下的弦理论是否可以用一组普遍的自由度来描述这一重要问题，我们的构造是一种很有前途的方法。我们还通过详细研究自由理论的规范固定条件和推导相关的传播子，向开放超弦场论的量子化迈出了第一步。

We constructed analytic solutions of open string field theory using boundary condition changing operators in boundary conformal field theory and extended the solutions to open superstring field theory. Although our construction is limited to the case where the boundary condition changing operators satisfy some regularity conditions, it can be a promising approach to the important problem of whether string theories around different backgrounds can be described by a universal set of degrees of freedom. We also took a first step to the quantization of open superstring field theory by studying gauge fixing conditions of the free theory in detail and by deriving associated propagators.