Asymmetric Sky from the Long Mode Modulations

Understand

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.