标题： 具有大质量态的树级宇宙学关联函数的微分方程 显示英文标题

标题： Differential equations for tree--level cosmological correlators with massive states

摘要： 我们研究了de Sitter宇宙中具有内部和外部大质量态的双点树级宇宙相关函数的数学性质。 我们采用了分部积分恒等式、（相对）扭曲上同调以及微分方程方法。 我们明确地将内部有质量、外部共形耦合的相关函数表示为关于小质量参数的幂级数，其中级数的各项由多重多对数给出。 显示英文摘要

摘要： We study mathematical aspects concerning two site tree-level cosmological correlators with massive internal and external states in a de Sitter universe. We employ integration by parts identities, (relative) twisted cohomology and the method of differential equations. We explicitly express the internally massive, externally conformally coupled correlator as a power series with respect to a small mass parameter, where the various terms in the series are given by multiple polylogarithms.