2016
DOI: 10.1103/physrevd.93.023524
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Large-scale anomalies in the cosmic microwave background as signatures of non-Gaussianity

Abstract: We derive a general expression for the probability of observing deviations from statistical isotropy in the cosmic microwave background (CMB) if the primordial fluctuations are non-Gaussian and extend to superhorizon scales. The primary motivation is to properly characterize the monopole and dipole modulations of the primordial power spectrum that are generated by the coupling between superhorizon and subhorizon perturbations. Unlike previous proposals for generating the hemispherical power asymmetry, we do no… Show more

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Cited by 39 publications
(50 citation statements)
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References 85 publications
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“…However, for example, in the non-Gaussianity -generated cases of Ref. [12], the suppression seems to be squareroot rather than linear /2, less sharp than in our case. Higher multipoles can thus be used as a cross-check to distinguish between different explanations for the origin of the dipole asymmetry.…”
Section: The Existence Of Quadrupole Term B(x ·N)contrasting
confidence: 80%
See 1 more Smart Citation
“…However, for example, in the non-Gaussianity -generated cases of Ref. [12], the suppression seems to be squareroot rather than linear /2, less sharp than in our case. Higher multipoles can thus be used as a cross-check to distinguish between different explanations for the origin of the dipole asymmetry.…”
Section: The Existence Of Quadrupole Term B(x ·N)contrasting
confidence: 80%
“…The observation of the hemispherical asymmetry in the CMB in that scenario provides information about the distribution of energy momentum tensor at the scales beyond our horizon. Another variant of this scenario which includes all superhorizon modes and nongaussianity on scales larger than the scale of our universe are considered [12], tackles the fine-tuning issue better. As we will see, what our computations show is that if the energy-momentum tensor of the inflaton is anisotropic "within the horizon patch" in the beginning of inflation, no matter how long the subsequent inflation lasts, the resulted power spectrum is anisotropic.…”
Section: Asymmetric Excited Initial Statesmentioning
confidence: 99%
“…Essentially, one can thus "trade" the breaking of statistical isotropy for the presence of primordial non-Gaussianity. These ideas have been further elaborated by [154,155,156].…”
Section: Primordial Power Spectrum -Broken Isotropymentioning
confidence: 99%
“…The most popular inflation-based explanations deploy the Erickcek-Carroll-Kamionkowski mechanism, in which a single super-horizon mode of exceptional amplitude modulates the small-scale power spectrum (see Ref. [19] for a generalization to include all superhorizon modes). But until now, comparisons of the scenario with observation have not accounted for the scale-dependence of the asymmetry-or the bispectrum which is responsible for it.…”
Section: Discussionmentioning
confidence: 99%