论文标题
用gw $ v $模式探测奇偶校验双偏见
Probing parity-odd bispectra with anisotropies of GW $V$ modes
论文作者
论文摘要
众所周知，非平凡的挤压张量双光谱可以导致通货膨胀随机引力波（GW）背景中各向异性，从而为我们提供了与CMB相对于CMB的原始非高斯（NGS）的替代性和互补窗口。以前的作品强调了通过GW $ i $ mmode各向异性的奇偶校验前景。在这项工作中，我们通过首次分析GW $ V $ -Mode Anisotropies施加的其他信息来扩展这一点。我们表明，GW $ V $模式使我们能够探测奇迹 - odd $ \ langle \ rm tts \ rangle $和$ \ langle \ rm ttt \ rangle $ bispectra。这些双光谱在非线性水平上的均等差异，可以通过在通货膨胀期间允许替代对称性破坏模式来引入，例如在固体通货膨胀中包含的对称性。考虑到类似BBO的实验，我们发现在$ v $模式偶极子中对挤压$ \ langle \ rm tts \ rangle $ parity-odd bispectra的非零检测是可能的，而无需对GW Power Spectrum amplation by cmbb设置的限制性放大器进行任何短规模增强。我们还简要讨论$ v $ -CMB互相关的作用。我们的工作可以沿多个方向扩展，并激励在接下来的GW实验中系统地搜索两极分化的GW各向异性。
It is well known that non-trivial squeezed tensor bispectra can lead to anisotropies in the inflationary stochastic gravitational wave (GW) background, providing us with an alternative and complementary window to primordial non-Gaussianities (NGs) with respect to the CMB. Previous works have highlighted the detection prospects of parity-even tensor NGs via the GW $I$-mode anisotropies. In this work we extend this by analysing for the first time the additional information carried by GW $V$-mode anisotropies due to squeezed NGs. We show that GW $V$ modes allow us to probe parity-odd squeezed $\langle \rm tts \rangle$ and $\langle \rm ttt \rangle$ bispectra. These bispectra break parity at the non-linear level and can be introduced by allowing alternative symmetry breaking patterns during inflation, like those comprised in solid inflation. Considering a BBO-like experiment, we find that a non-zero detection of squeezed $\langle \rm tts \rangle$ parity-odd bispectra in the $V$ modes dipole is possible without requiring any short-scale enhancement of the GW power spectrum amplitude over the constraints set by the CMB. We also briefly discuss the role of $V$-CMB cross-correlations. Our work can be extended in several directions and motivates a systematic search for polarized GW anisotropies in the next generations of GW experiments.
