According to the Cosmological Principle, the Universe is isotropic and no preferred direction would be seen by an observer that might be stationary with respect to the expanding cosmic fluid. However, because of observer’s partaking in the solar system peculiar motion, there would appear in some of the observed properties of the Cosmos a dipole anisotropy, which could in turn be exploited to determine the peculiar motion of the solar system. The dipole anisotropy in the Cosmic Microwave Background Radiation (CMBR) has given a peculiar velocity vector 370 km s${}^{-1}$ along $l={264}^{\circ },b={48}^{\circ }$. However, some other dipoles, for instance, from the number counts, sky brightness or redshift distributions in large samples of distant Active Galactic Nuclei (AGNs), have yielded values of the peculiar velocity many times larger than that from the CMBR, though surprisingly, in all cases the directions agreed with the CMBR dipole. Here we determine our peculiar motion from a sample of 0.28 million AGNs, selected from the Mid Infra Red Active Galactic Nuclei (MIRAGN) sample comprising more than a million sources. From this, we find a peculiar velocity, which is more than four times the CMBR value, although the direction seems to be within ∼2$\sigma$ of the CMBR dipole. A genuine value of the solar peculiar velocity should be the same irrespective of the data or the technique employed to estimate it. Therefore, such discordant dipole amplitudes might mean that the explanation for these dipoles, including that of the CMBR, might in fact be something else. The observed fact that the direction in all cases is the same, though obtained from completely independent surveys using different instruments and techniques, by different sets of people employing different computing routines, might nonetheless indicate that these dipoles are not merely due to some systematics, otherwise why would they all be pointing along the same direction. It might instead suggest a preferred direction in the Universe, implying a genuine anisotropy, which would violate the Cosmological Principle, the core of the modern cosmology.

中文翻译：

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从中红外AGN的数量计数和宇宙学原理的不一致推论出我们的奇特运动

根据宇宙学原理，宇宙是各向同性的，观察者不会看到相对于膨胀的宇宙流体静止的最佳方向。但是，由于观察者参与了太阳系的奇特运动，因此在宇宙的某些观测特性中会出现偶极各向异性，这又可以用来确定太阳系的奇特运动。宇宙微波背景辐射（CMBR）中的偶极各向异性给出了370 km s的特殊速度矢量${}^{-\mathrm{1个}}$ 沿着 $升={264}^{\circ }，b={48}^{\circ }$。但是，例如，从遥远的主动银河核（AGN）的大量样本中的数量计数，天空亮度或红移分布中得出的其他一些偶极子所产生的奇异速度值比CMBR大得多，是令人惊讶的，在所有情况下，指示均与CMBR偶极子一致。在这里，我们从28万个AGN样本中确定了我们的特殊运动，该样本选自中红外活动银河核（MIRAGN）样本，该样本包括超过一百万个源。由此，我们发现了一个奇特的速度，该速度是CMBR值的四倍以上，尽管方向似乎在〜2之内$\sigma$CMBR偶极子的 太阳奇特速度的真实值应该相同，而与数据或估计它所采用的技术无关。因此，这种不一致的偶极振幅可能意味着对这些偶极子的解释，包括CMBR的解释，实际上可能是另外一种解释。观察到的事实在所有情况下都是相同的，尽管通过使用不同的计算例程的不同组的人使用不同的仪器和技术从完全独立的调查中获得，但可能表明这些偶极子不仅仅是由于某些系统的原因，否则他们为什么都指向同一方向。相反，它可能暗示了宇宙的首选方向，暗示着真正的各向异性，这将违反宇宙学原理，