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arXiv 2301.07047hep-thastro-ph.COhep-ph
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暴胀关联函数的闭式公式

Closed-Form Formulae for Inflation Correlators

Zhehan Qin, Zhong-Zhi Xianyu

AI总结:

本研究通过改进的bootstrap方法结合合适变量替换,推导了含单有质量粒子树级交换的一大类暴胀两点、三点关联函数的精确闭式表达式,覆盖多种宇宙学对撞机模型,可用于唯象研究及构建更复杂的关联函数。

摘要:

我们推导了一大类含单个有质量粒子树级交换的两点、三点暴胀关联函数的精确闭式表达式。中间有质量粒子可具有任意质量、自旋、化学势,且与外暴胀子模式间可存在任意非导数或导数耦合。我们还允许耦合系数对共形时间具有任意复幂次依赖关系。我们的结果为仅含常见特殊函数、无任何无穷求和的闭式表达式,这一成果通过一种经改进的、搭配合适变量替换的bootstrap方法实现。我们的结果覆盖了广泛的宇宙学对撞机模型,可直接用于未来的唯象研究,也可作为构建更复杂暴胀关联函数的基础模块。

英文摘要:

We derive exact and closed-form expressions for a large class of two-point and three-point inflation correlators with the tree-level exchange of a single massive particle. The intermediate massive particle is allowed to have arbitrary mass, spin, chemical potential, and arbitrary nonderivative or derivative couplings to external inflaton modes. We also allow the coupling coefficients to have arbitrary complex power dependences on the conformal time. Our results feature closed-form expressions involving only familiar special functions and without any infinite sums. This is achieved by an improved bootstrap method with a suitable change of variables. Our results cover a wide range of cosmological collider models and can be directly used for future phenomenological studies. Our results can also be used as basic building blocks for constructing more complicated inflation correlators.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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