Differential equations for tree--level cosmological correlators with massive states
Federico Gasparotto, Pouria Mazloumi, Xiaofeng Xu
公開日: 2024/11/8
Abstract
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.