Can baryon asymmetry be explained by a large initial value before inflation?

TL;DR

The paper argues that a large initial value before inflation cannot explain baryon asymmetry due to resulting isocurvature perturbations incompatible with CMB data.

Contribution

It demonstrates that initial conditions with large values before inflation are incompatible with observed baryon asymmetry and CMB constraints.

Findings

Large initial values predict baryon isocurvature perturbations.

Such perturbations are excluded by CMB observations.

The argument applies to some dark matter models as well.

Abstract

We show that the baryon asymmetry of the Universe cannot be explained by a large initial value before inflation because it inevitably predicts correlated baryon isocurvature perturbations that are already excluded by cosmic microwave background observations. Similar arguments can generally be applied to some models of dark matter.