Asymmetric Sky from the Long Mode Modulations

Abstract

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 $\Lambda CDM$ universe because the super-horizon curvature perturbation is conserved in this background.

V2: Discussions improved, the analysis of dipole asymmetry in dark energy is revised

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• Expected dipole asymmetry in CMB polarization
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• Towards the bounce inflationary gravitational wave
• Scalar-Tensor Anti-Cross-Correlation does not Help to Reconcile the Tension between BICEP2 and Planck
• 21-cm power spectrum and ionization bias as a probe of long-mode modulated non Gaussian sky
• Dipole Modulation in Tensor Modes: Signatures in CMB Polarization