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Nucleation is more than critical: A case study of the electroweak phase transition in the NMSSM

机译:成核不仅仅是关键:NMSSSM中电壕期相变的案例研究

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A bstract Electroweak baryogenesis is an attractive mechanism to generate the baryon asymmetry of the Universe via a strong first order electroweak phase transition. We compare the phase transition patterns suggested by the vacuum structure at the critical temperatures , at which local minima are degenerate, with those obtained from computing the probability for nucleation via tunneling through the barrier separating local minima. Heuristically, nucleation becomes difficult if the barrier between the local minima is too high, or if the distance (in field space) between the minima is too large. As an example of a model exhibiting such behavior, we study the Next-to-Minimal Supersymmetric Standard Model, whose scalar sector contains two SU(2) doublets and one gauge singlet. We find that the calculation of the nucleation probabilities prefers different regions of parameter space for a strong first order electroweak phase transition than the calculation based solely on the critical temperatures. Our results demonstrate that analyzing only the vacuum structure via the critical temperatures can provide a misleading picture of the phase transition patterns, and, in turn, of the parameter space suitable for electroweak baryogenesis.
机译:Bstract Electroweak胸氨酸是一种有吸引力的机制,通过强大的第一阶Electroweak相转变产生宇宙的细子不对称性。我们比较临界温度下的真空结构所提出的相变模式,其中局部最小值是退化的,其中通过通过隧道通过屏障分离局部最小值来计算核心的概率。如果局部最小值之间的屏障太高,或者如果最小值之间的距离(在现场空间中)太大的距离(在现场空间)太大的情况下,成核变得困​​难。作为一种模式的一个例子显示出这样的行为,我们研究了下一步到最小超对称模型,其标量扇区包含两个SU(2)和双峰一个规单峰。我们发现成核概率的计算比仅基于临界温度的计算,对核心概率的计算优于具有强的第一阶Electroweak相位过渡的不同区域。我们的结果表明,仅通过临界温度分析真空结构可以提供相变图案的误导性图像,并且又是适合于电挖掘的参数空间。

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