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arXiv 2603.27985gr-qc
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引力波极化模式与韦伊尔几何引力中的稳定性分析

Gravitational wave polarization modes and stability analysis in Weyl geometry gravity

Lanzhou University(兰州大学)

Yu-Zhi Fan, Xiao-Bin Lai, Yu-Qi Dong, Yu-Xiao Liu

AI总结:

研究韦伊尔几何引力中引力波极化模式及稳定性,发现张量部分包含两种标准模式,标量部分存在呼吸和纵向混合模式,且受韦伊尔规范场影响产生超光速传播和振幅衰减,标量部分存在Ostrogradsky鬼不稳定性。

摘要:

我们研究了在闵氏背景下的韦伊尔几何引力中的引力波极化模式及稳定性。结果表明,张量部分包含两种标准模式,以光速传播。尽管矢量部分具有动态自由度,但不产生极化模式。标量部分则具有呼吸和纵向模式的混合,与单一标量自由度相关。该自由度受背景韦伊尔规范场驱动,产生超光速传播和内在振幅衰减。我们进一步讨论了该标量模式的观测可检测性。稳定性分析表明,张量和矢量部分无鬼和拉普拉斯不稳定性,而标量部分存在Ostrogradsky鬼不稳定性。这些发现澄清了韦伊尔几何引力中的引力波传播特性,并为通过未来多信使观测测试理论提供了理论基础。

英文摘要:

We investigate the gravitational wave polarization modes and stability in Weyl geometry gravity within a Minkowski background. Our results indicate that the tensor sector consists of two standard modes propagating at the speed of light. Although the vector sector possesses a dynamical perturbation, it generates no polarization modes. The scalar sector, in contrast, features a mixture mode of breathing and longitudinal modes associated with a single scalar degree of freedom. The propagating solutions of this scalar mode exhibit superluminal propagation and can undergo intrinsic amplitude decay, both of which are driven by the background Weyl gauge field. We further discuss the observational detectability of this scalar mode. Our stability analysis reveals that, while the tensor and vector sectors are free from ghost and Laplacian instabilities, the scalar sector suffers from a ghost instability. These findings clarify the unique gravitational wave propagation characteristics in Weyl geometry gravity and provide theoretical foundations for testing the theory through future multi-messenger observations.

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