标题： 重子生成的约束来自超弦轴子的衰变 显示英文标题

标题： Constraints on Baryogenesis from the Decay of Superstring Axions

摘要： 我们计算了超弦轴子衰变对重子-光子比的稀释效应。 我们发现稀释的程度约为$10^7$。 我们回顾了几种重子生成模型，并表明其中大多数无法容忍如此大的稀释。 特别是，目前只有一个电弱重子生成模型可能存活下来。 在超对称大统一理论中的Affleck-Dine机制非常稳健，轴子引起的稀释可能有助于这些模型所需的稀释。 涉及拓扑缺陷和黑洞蒸发的重子生成情景也能够产生足够大的重子不对称性。 显示英文摘要

摘要： We calculate the dilution of the baryon-to-photon ratio by the decay of superstring axions. We find that the dilution is of the order of $10^7$. We review several models of baryogenesis and show that most of them can not tolerate such a large dilution. In particular, only one current model of electroweak baryogenesis possibly survives. The Affleck-Dine mechanism in SUSY GUTs is very robust and the dilution by axions could contribute to the dilution required in these models. Baryogenesis scenarios involving topological defects and black hole evaporation are also capable of producing a sufficiently large baryon asymmetry.