标题： 无自旋时空中的新引力波极化模式 显示英文标题

标题： New gravitational wave polarization modes in the torsionless spacetime

摘要： 本研究在无挠率时空框架下，利用Palatini形式探讨引力波的偏振特性。我们的分析揭示了存在两种新的偏振模式，称为剪切模式，它们超越了四维黎曼时空中传统的六种模式。 这些剪切模式由与非度量性相关的向量自由度独特驱动，被归类为向量模式，其探测提供了探索时空基本结构和检验引力理论的独特机会。 这些模式扩展了标准的引力波偏振范式，并为引力波探测器提供了新的观测特征。 显示英文摘要

摘要： In this study, we investigate the polarization properties of gravitational waves within a torsionless spacetime framework, as described by the Palatini formalism. Our analysis uncovers the presence of two novel polarization modes, referred to as shear modes, which extend beyond the traditional set of six modes in a four-dimensional Riemannian spacetime. These shear modes, uniquely driven by vector degrees of freedom associated with non-metricity, are classified as vector modes, and their detection provides a unique opportunity to explore the fundamental structure of spacetime and to test gravity theories. These modes extend the standard gravitational wave polarization paradigm and provide novel observational signatures for gravitational wave detectors.