宇称违背的哥白尼宇宙中的重力波
Gravity waves in parity-violating Copernican Universes
摘要：
在最近的工作中，已经提出了允许通过平衡扭转来改变宇宙学常数的最小理论。有人发现，这种理论包含奇偶违反均匀和各向同性的解决方案，由于扭转结构称为嘉当螺旋楼梯。它们的动力学由作用量中的Euler和Pontryagin准拓扑项控制。在这里，我们表明，这样的理论预测一个显着不同的图片引力波波动的宇称违反分支。如果动力学只受欧拉型项支配，那么线性张量模扰动是完全不确定的，暗示了一种新的规范不变性。庞特里亚金项不仅允许现象学上健全的背景解决方案（如在以前的文献中发现），但现实的传播引力波模式。我们讨论了这些理论的观测约束和预测。
英文摘要：
In recent work minimal theories allowing the variation of the cosmological constant by means of a balancing torsion, have been proposed. It was found that such theories contain parity violating homogeneous and isotropic solutions, due to a torsion structure called the Cartan spiral staircase. Their dynamics are controlled by Euler and Pontryagin quasi-topological terms in the action. Here we show that such theories predict a dramatically different picture for gravitational wave fluctuations in the parity violating branch. If the dynamics are ruled solely by the Euler-type term, then linear tensor mode perturbations are entirely undetermined, hinting at a new type of gauge invariance. The Pontryagin term not only permits for phenomenologically sounder background solutions (as found in previous literature), but for realistic propagation of gravitational wave modes. We discuss the observational constraints and predictions of these theories.
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