1306.6932 (Ali Akbar Abolhasani et al.)

Asymmetric Sky from the Long Mode Modulations    [PDF]

Ali Akbar Abolhasani, Shant Baghram, Hassan Firouzjahi, Mohammad Hossein Namjoo

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, (b): the halo bias parameter and (c): late time acceleration expansion. These are different phenomena relevant to different cosmological histories but all 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, halo bias parameter and acceleration expansion to the amplitude of dipole asymmetry generated on CMB power spectrum.

View original: http://arxiv.org/abs/1306.6932