arXiv 1104.47912011-04-25hep-ph

TeV尺度近似共形动力学的宇宙学结果

Cosmological Consequences of Nearly Conformal Dynamics at the TeV scale

Thomas Konstandin, Geraldine Servant

备注：: 22 pages, 7 figures
DOI：: 10.1088/1475-7516/2011/12/009

摘要：

在TeV尺度上的近共形动力学的层次问题的动机，其特征在于在电弱时代的一个阶段的显着过冷。这具有重要的宇宙学后果。特别是，关于宇宙历史的一个常见假设是，再加热温度很高，至少高到足以假设TeV质量的粒子曾经处于热平衡。然而，正如我们在本文中所讨论的，这种假设是没有很好地证明在TeV尺度的强动力学的一些模型。然后，我们需要重新审视如何在这些理论中实现重子生成，以及重新考虑暗物质丰度是如何遗传的。我们认为，重子和暗物质的丰度可以解释自然在这些设置中，再加热发生在年底的强烈的一阶相变特征共形对称性破缺的气泡碰撞，即使再加热温度低于电弱标度$\sim 100$ GeV。我们还讨论了膨胀以及重力波吸烟枪签名这类模型。

英文摘要：

Nearly conformal dynamics at the TeV scale as motivated by the hierarchy problem can be characterized by a stage of significant supercooling at the electroweak epoch. This has important cosmological consequences. In particular, a common assumption about the history of the universe is that the reheating temperature is high, at least high enough to assume that TeV-mass particles were once in thermal equilibrium. However, as we discuss in this paper, this assumption is not well justified in some models of strong dynamics at the TeV scale. We then need to reexamine how to achieve baryogenesis in these theories as well as reconsider how the dark matter abundance is inherited. We argue that baryonic and dark matter abundances can be explained naturally in these setups where reheating takes place by bubble collisions at the end of the strongly first-order phase transition characterizing conformal symmetry breaking, even if the reheating temperature is below the electroweak scale $\sim 100$ GeV. We also discuss inflation as well as gravity wave smoking gun signatures of this class of models.

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