从长模调制看非对称天空
Asymmetric Sky from the Long Mode Modulations
摘要：
在宇宙微波背景辐射中观测到的偶极不对称性可能源于超视界长波模的调制。在这项工作中，我们揭示了从长波长模式调制产生的不对称性的不同方面。我们发现，相同的机制，导致观察到的CMB功率谱偶极子不对称的长模调制也产生偶极子不对称的（a）：张量扰动功率谱和（b）：晕偏置参数。这些是与不同宇宙学历史相关的不同现象，但在天空中产生不对称性的基础机制相同。得到了由张量扰动和Halo偏置参数产生的偶极不对称性的振幅与由CMB功率谱产生的偶极不对称性的振幅之间的一致性条件。此外，我们还证明了在$ΛCDM$宇宙中，由于超视界曲率微扰是守恒的，所以这种机制在加速膨胀中不会产生偶极不对称性.
英文摘要：
The observed dipole asymmetry in Cosmic Microwave Background radiation may have originated from the modulations of super-horizon long wavelength modes. In this work we unveil different aspects of asymmetries generated from the long wavelength mode modulations. We show that the same mechanism which leads to the observed CMB power spectrum dipole asymmetry from the long mode modulations also yields dipole asymmetry in (a): tensor perturbations power spectrum and (b): the halo bias parameter. These are different phenomena relevant to different cosmological histories but both share the same underlying mechanism in generating asymmetries in the sky. We obtain the set of consistency conditions relating the amplitude of dipole asymmetries generated on tensor perturbations and halo bias parameter to the amplitude of dipole asymmetry generated on CMB power spectrum. In addition, we show that this mechanism does not produce dipole asymmetry in acceleration expansion in $ΛCDM$ universe because the super-horizon curvature perturbation is conserved in this background.
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