论文标题
矢量暗辐射和重力波偏振
Vector dark radiation and gravitational-wave polarization
论文作者
论文摘要
我们考虑可以发挥宇宙暗辐射成分的作用的共形矢量模型。我们分析了在这种载体背景的存在下重力波的传播，并在大尺度上发现张量转移函数的抑制作用。我们还发现，尽管宇宙背景度量是各向同性的，但各向异性却印有张量功率谱。另外，背景矢量场的存在引起了引力波背景的净极化，对于矢量场的某些配置，是圆形极化转换。我们还表明，对于具有更一般潜在术语的矢量模型，这种效果也存在。
We consider conformal vector models which could play the role of a cosmological dark radiation component. We analyse the propagation of gravitational waves in the presence of this vector background and find a suppression in the tensor transfer function at large scales. We also find that although the cosmological background metric is isotropic, anisotropies are imprinted in the tensor power spectrum. In addition, the presence of the background vector fields induces a net polarization of the gravitational wave background and, for certain configurations of the vector field, a linear to circular polarization conversion. We also show that this kind of effects are also present for vector models with more general potential terms.
