标题： 暴胀期间无质量标量场红外关联的自调节 显示英文标题

标题： Self Regulation of Infrared Correlations for Massless Scalar Fields during Inflation

摘要： 在de Sitter背景下，使用位置空间传播子计算了与四次和三线性相互作用最小耦合标量场的自能。对于四次相互作用，我们得到了海鸥图的有效结果，即在稳态de Sitter背景下的红外增强下，它在主导阶上为标量场贡献了一个有效质量。我们进一步表明，日落图也对这个有效质量有贡献，并且认为这两个贡献足以确定一个自洽的动力学质量。此外，三线性相互作用也会诱导标量场的动力学质量，我们对其进行了计算。由于de Sitter中的相互作用标量场通过这些圈修正获得了动力学质量，两点关联函数的红外发散自然地自我调节。 显示英文摘要

摘要： Self-energies of a minimally coupled scalar field with quartic and trilinear interactions are calculated in a de Sitter background, using a position space propagator. For quartic interactions, we recover earlier results for the seagull diagram, namely that it contributes an effective mass for the scalar field at leading order in the infrared enhancement in a steady-state de Sitter background. We further show that the sunset diagram also contributes to this effective mass and argue that these two contributions are sufficient in order to determine a self-consistent dynamical mass. In addition, trilinear interactions also induce a dynamical mass for the scalar field which we calculate. Since an interacting scalar field in de Sitter acquires a dynamical mass through these loop corrections, the infrared divergences of the two-point correlator are naturally self-regulated.