论文标题
引起的超耐量张量来自各向异性非高斯性
Induced superhorizon tensor perturbations from anisotropic non-Gaussianity
论文作者
论文摘要
我们研究了在各向异性非陶氏性的存在下由二阶标量扰动引起的宇宙学张量扰动。这类诱导的张量模式通过长模式和短模式之间的固有四极杆耦合在超轨道尺度上产生。从通货膨胀哈勃半径到重组时丝阻尼量表的所有尺度上的标量扰动均导致宇宙微波背景（CMB）量表的诱导张量。另外，诱导的张量光谱几乎变成了尺度不变。前者的特性表明，CMB的测量值提供了微小物理学的测试。然而，后者意味着次要效应可能污染原始张量光谱，这告诉我们通货膨胀的能量尺度。我们得出了诱导的张量模式，源自两个各向异性非高斯性的具体例子。统计上各向异性的标量非高斯性和标量量表张量的非高斯性，并讨论了极短的物理学的观察后果。此外，我们对通过非标准早期宇宙物理学增强诱导频谱的各种可能性发表评论。
We study cosmological tensor perturbations induced by second-order scalar perturbations in the presence of anisotropic non-Gaussianity. This class of induced tensor modes arises on superhorizon scales through the intrinsic quadrupole coupling between long modes and short modes. Scalar perturbations on all scales from the inflationary Hubble radius to the Silk damping scale at recombination contribute to the induced tensor powerspectrum at the cosmic microwave background (CMB) scale. In addition, the induced tensor spectrum becomes almost scale-invariant. The former property suggests that measurements of the CMB offer a test of tiny scale physics. However, the latter implies the secondary effect may contaminate the primordial tensor spectrum, which tells us the energy scale of inflation. We derive the induced tensor modes originated from two concrete examples of anisotropic non-Gaussianity; statistically anisotropic scalar non-Gaussianity and scalar-scalar-tensor non-Gaussianity, and discuss observational consequences of extremely short scale physics. Also, we comment on various possibilities of enhancing the induced spectrum with nonstandard early Universe physics.
