论文标题
通货膨胀的统计型抗脉冲张量
Statistically-Anisotropic Tensor Bispectrum from Inflation
论文作者
论文摘要
我们有可能在各向异性通货膨胀中产生张量非高斯性，其中$ u（1）$ gauge字段在动力学上与观众标量场耦合。由于这种耦合，电场的连贯模式出现并轻轻打破了宇宙的各向同性。我们计算由量规场采购的线性偏振张量扰动的双光谱，并发现其强烈红倾斜，并具有独特的统计各向异性，包括高阶多极矩。有趣的是，具有线性极化模式的特定组合的张量双光谱是主导的，它们的幅度取决于不同的多极矩。这种新型类型的统计型 - 异位量张量非高斯性可能可以通过即将进行的宇宙微波背景B模式极化实验进行测试。
We develop a possibility of generating tensor non-Gaussianity in a kind of anisotropic inflation, where a $U(1)$ gauge field is kinetically coupled to a spectator scalar field. Owing to this coupling, the coherent mode of the electric field appears and softly breaks the isotropy of the Universe. We compute the bispectrum of linearly-polarized tensor perturbations sourced by the gauge field and find that it is strongly red-tilted and has distinctive statistical anisotropies including higher-order multipole moments. Interestingly, the tensor bispectra with the specific combinations of linear polarization modes are dominant, and their amplitudes depend on the different sets of multipole moments. This new type of statistically-anisotropic tensor non-Gaussianity can be potentially testable with the upcoming cosmic microwave background B-mode polarization experiments.
