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arXiv 1606.08862astro-ph.COgr-qc
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由CMB B模弱透镜效应约束随机引力波背景

Constraining stochastic gravitational wave background from weak lensing of CMB B-modes

Shabbir Shaikh, Suvodip Mukherjee, Aditya Rotti, Tarun Souradeep

摘要:

随机引力波背景(SGWB)通过弱透镜效应影响CMB各向异性。与由于仅使光子轨迹偏转的大尺度结构引起的弱透镜作用不同,SGWB具有沿着轨迹旋转偏振矢量的附加效果。我们研究了这两种效应的相对重要性,偏转和旋转,特别是在由SGWB引起的弱透镜效应引起的E模式到B模式功率转移的背景下。使用弱透镜畸变的CMB作为探针,我们得到的光谱能量密度($Ω_{GW}$)的SGWB,来源于不同的红移,而不假设任何特定的模型为它的起源的约束。我们提出了这些界限$Ω_{GW}$不同的幂律模型表征的SGWB,表明阈值以上,可观察到的印记的SGWB必须存在于CMB。

英文摘要:

A stochastic gravitational wave background (SGWB) will affect the CMB anisotropies via weak lensing. Unlike weak lensing due to large scale structure which only deflects photon trajectories, a SGWB has an additional effect of rotating the polarization vector along the trajectory. We study the relative importance of these two effects, deflection \& rotation, specifically in the context of E-mode to B-mode power transfer caused by weak lensing due to SGWB. Using weak lensing distortion of the CMB as a probe, we derive constraints on the spectral energy density ($Ω_{GW}$) of the SGWB, sourced at different redshifts, without assuming any particular model for its origin. We present these bounds on $Ω_{GW}$ for different power-law models characterizing the SGWB, indicating the threshold above which observable imprints of SGWB must be present in CMB.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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