arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1507.07525hep-ph
收藏

有限温度电弱弛豫

Electroweak relaxation from finite temperature

Edward Hardy

摘要:

我们研究的理论,自然选择真空与参数小电弱标度由于有限的温度效应在早期宇宙。特别是,有一个标量的近似位移对称性打破了技术上自然的小耦合到希格斯玻色子,和一个温度依赖的潜力。随着宇宙温度的下降,标量遵循其势能的最小值,改变希格斯质量平方参数。标量也有一个振幅与希格斯期望值成正比的周期性势,它将标量困在一个具有小电弱标度的真空中。所需的温度依赖性的潜力,可以发生通过强耦合效应在一个隐藏的部门,在高温下受到抑制。或者,它可以从单回路热势微扰产生。在这两种情况下,要使标量移位,必须将隐藏扇区重新加热到明显高于可见扇区的温度。然而,这并不违反观测的限制,只要隐藏的扇区能量密度转移到可见扇区,而不破坏大爆炸核合成。我们还研究了如何实现的机制时,可见部门完成的最小超对称标准模型在高尺度。紫外截止值为10 TeV且没有场的取值范围大于10^12 GeV的模型是可能的,尽管标量在其势的周期部分必须有10^8倍数量级的有效衰变常数。

英文摘要:

We study theories which naturally select a vacuum with parametrically small Electroweak Scale due to finite temperature effects in the early universe. In particular, there is a scalar with an approximate shift symmetry broken by a technically natural small coupling to the Higgs, and a temperature dependent potential. As the temperature of the universe drops, the scalar follows the minimum of its potential altering the Higgs mass squared parameter. The scalar also has a periodic potential with amplitude proportional to the Higgs expectation value, which traps it in a vacuum with a small Electroweak Scale. The required temperature dependence of the potential can occur through strong coupling effects in a hidden sector that are suppressed at high temperatures. Alternatively, it can be generated perturbatively from a one-loop thermal potential. In both cases, for the scalar to be displaced, a hidden sector must be reheated to temperatures significantly higher than the visible sector. However this does not violate observational constraints provided the hidden sector energy density is transferred to the visible sector without disrupting big bang nucleosynthesis. We also study how the mechanism can be implemented when the visible sector is completed to the Minimal Supersymmetric Standard Model at a high scale. Models with a UV cutoff of 10 TeV and no fields taking values over a range greater than 10^12 GeV are possible, although the scalar must have a range of order 10^8 times the effective decay constant in the periodic part of its potential.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑