Loop quantum cosmology, non-Gaussianity, and CMB power asymmetry

Abstract

We argue that the anomalous power asymmetry observed in the cosmic microwave background (CMB) may have originated in a cosmic bounce preceding inflation. In loop quantum cosmology (LQC) the big bang singularity is generically replaced by a bounce due to quantum gravitational effects. We compute the spectrum of inflationary non-Gaussianity and show that strong correlation between observable scales and modes with longer (super-horizon) wavelength arise as a consequence of the evolution of perturbations across the LQC bounce. These correlations are strongly scale dependent and induce a dipole-dominated modulation on large angular scales in the CMB, in agreement with observations.

7 pages, 3 figure

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Cited by in corpus (52)

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• Towards Cosmological Dynamics from Loop Quantum Gravity
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• Primordial power spectra for scalar perturbations in loop quantum cosmology
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• Testing loop quantum cosmology
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• Large scale anomalies in the CMB and non-Gaussianity in bouncing cosmologies
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• Anomalies in the CMB from a cosmic bounce
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