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arXiv 1104.4793hep-ph
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从强相互作用电弱对称性破缺看自然冷重子生成

Natural Cold Baryogenesis from Strongly Interacting Electroweak Symmetry Breaking

Thomas Konstandin, Geraldine Servant

摘要:

“冷电弱重子生成”机制迄今为止一直不受欢迎,因为它的提议依赖于一个特别的假设,即在电弱尺度上有一段混合暴胀时期,希格斯粒子充当瀑布场。我们认为,冷重子生成可以自然地实现,而不需要引入任何慢滚潜力。我们的观点是,复合希格斯模型中的电弱对称性破缺产生通过一个强烈的一阶相变提供了一个很好的动机框架冷重子。在这种情况下,再加热收益的气泡碰撞,我们认为,这可能会导致陈-西蒙斯数的变化,这在存在新的来源的CP破坏通常导致重子生成。我们说明了这种机制使用作为一个源的CP破坏一个有效的维度6运营商,这是免费的EDM的限制,另一个优势,冷重子的电弱重子的标准理论相比。我们的结果是一般的,因为他们不依赖于任何特定的紫外线完成,但只有一个阶段的过冷结束的一阶相变在宇宙的演化,这可能是自然的,如果有近共形动力学在TeV尺度。此外,重子数的破坏只来源于标准模型。

英文摘要:

The mechanism of "cold electroweak baryogenesis" has been so far unpopular because its proposal has relied on the ad-hoc assumption of a period of hybrid inflation at the electroweak scale with the Higgs acting as the waterfall field. We argue here that cold baryogenesis can be naturally realized without the need to introduce any slow-roll potential. Our point is that composite Higgs models where electroweak symmetry breaking arises via a strongly first-order phase transition provide a well-motivated framework for cold baryogenesis. In this case, reheating proceeds by bubble collisions and we argue that this can induce changes in Chern-Simons number, which in the presence of new sources of CP violation commonly lead to baryogenesis. We illustrate this mechanism using as a source of CP violation an effective dimension-six operator which is free from EDM constraints, another advantage of cold baryogenesis compared to the standard theory of electroweak baryogenesis. Our results are general as they do not rely on any particular UV completion but only on a stage of supercooling ended by a first-order phase transition in the evolution of the universe, which can be natural if there is nearly conformal dynamics at the TeV scale. Besides, baryon-number violation originates from the Standard Model only.

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