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arXiv 2103.08248astro-ph.CO
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从宇宙微波背景的象差确定我们的特有速度

Determining our peculiar velocity from the aberration in the cosmic microwave background

Ralf Aurich, David Reinhardt

摘要:

我们太阳系相对于CMB静止坐标系的运动,由于像差效应,导致观测到的CMB星图发生细微的扭曲。通常由CMB偶极子确定相应的奇异速度,但忽略固有偶极子的贡献。在这里,它是调查是否某些不变的标量措施,这是来自一阶和二阶协变导数的球,可以检测到的畸变效应在高多极造成的失真。这将在原则上允许解开多普勒从固有偶极子的贡献提供了一个独立的方法来确定我们特有的速度。它被发现的Hessian矩阵的温度场的特征值是非常适合于这项任务。

英文摘要:

The motion of our solar system relative to the CMB rest frame leads to subtle distortions in the observed CMB sky map due to the aberration effect. Usually the corresponding peculiar velocity is determined from the CMB dipole but neglecting intrinsic dipole contributions. Here it is investigated whether certain invariant scalar measures, which are derived from first and second order covariant derivatives on the sphere, can detect the distortions caused by the aberration effect at high multipoles. This would in principle allow to disentangle the Doppler from intrinsic dipole contributions providing an independent method for the determination of our peculiar velocity. It is found that the eigenvalues of the Hessian matrix of the temperature field are well suited for that task.

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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