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Hemispherical Power Asymmetry from Scale-Dependent Modulated Reheating · Around

2013

Hemispherical Power Asymmetry from Scale-Dependent Modulated Reheating

McDonald, John

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We propose a new model for the hemispherical power asymmetry of the CMB based on modulated reheating.

Non-Gaussianity from modulated reheating can be small enough to satisfy the bound from Planck if the dominant modulation of the inflaton decay rate is linear in the modulating field $\sigma$.
$\sigma$ must then acquire a spatially-modulated power spectrum with a red scale-dependence.
This can be achieved if the primordial perturbation of $\sigma$ is generated via tachyonic growth of a complex scalar field.

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