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Stochastic baryogenesis
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DOI：10.1088/1475-7516/2021/01/022.png)
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Abstract
En 中文
Using a multi-field stochastic approach, we investigate the vacuum expectation value (VEV) during inflation of a scalar field charged under a mildly broken global U(1) symmetry that can play the role of baryon or lepton number, or possibly a dark baryon number or a combination of the three. Even for a CP invariant Lagrangian, the stochastic distribution of inflationary VEVs in general breaks CP spontaneously, allowing for successful baryogenesis via the Affleck-Dine mechanism. For the Hubble scale during inflation H-* as high as 10(13) GeV, we show that the post-inflationary relaxation of the charged scalar with stochastic initial conditions can explain the observed baryon asymmetry, and that a charged scalar mass at the order of H-* is favored by the isocurvature constraints.
Keywords:
baryon asymmetry
inflation
particle physics - cosmology connection
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