Large scale anisotropy due to pre-inflationary phase of cosmic evolution

Abstract

We show that perturbations generated during the anisotropic pre-inflationary stage of cosmic evolution may affect cosmological observations today for a certain range of parameters. Due to the anisotropic nature of the universe during such early times, it might explain some of the observed signals of large scale anisotropy. In particular we argue that the alignment of CMB quadrupole and octopole may be explained by the Sachs-Wolfe effect due to the large scale anisotropic modes from very early times of cosmological evolution. We also comment on how the observed dipole modulation of CMB power may be explained within this framework.

15 pages, 2 figures, substantially revised to provide better explanation of our results, no change in results or conclusions

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• Anisotropic universe with anisotropic sources
• Direction dependence of the power spectrum and its effect on the Cosmic Microwave Background Radiation
• Testing the Dipole Modulation Model in CMBR
• Probing statistical isotropy of cosmological radio sources using SKA
• Polarization Alignment in JVAS/CLASS flat spectrum radio surveys
• Relating the inhomogeneous power spectrum to the CMB hemispherical anisotropy
• Imprint of Inhomogeneous and Anisotropic Primordial Power Spectrum on CMB Polarization
• Primordial non-Gaussianities in single field inflationary models with non-trivial initial states
• Superhorizon perturbations: A possible explanation of the Hubble--Lemaître Tension and the Large Scale Anisotropy of the Universe
• Noncommutative Geometry and the Primordial Dipolar Imaginary Power Spectrum
• A study of Dipolar Signal in distant Quasars with various observables
• Cosmological Power Spectrum in Non-commutative Space-time
• Anisotropic power spectrum and the observed low-l power in PLANCK CMB data
• Probing Cosmology beyond $\Lambda$CDM using the SKA