Spontaneous Baryogenesis without Baryon Isocurvature

Abstract

We propose a new class of spontaneous baryogenesis models that does not produce baryon isocurvature perturbations. The baryon chemical potential in these models is independent of the field value of the baryon-generating scalar, hence the scalar field fluctuations are blocked from propagating into the baryon isocurvature. We demonstrate this mechanism in simple examples where spontaneous baryogenesis is driven by a non-canonical scalar field. The suppression of the baryon isocurvature allows spontaneous baryogenesis to be compatible even with high-scale inflation.

arXiv comment21 pages, 3 figures; v2: improved discussion of cutoff, published in JCAP

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• Dynamical measurements of deviations from Newton's $1/r^2$ law