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arXiv 2009.10080hep-phastro-ph.COgr-qchep-th
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宇宙学一级相变的理论不确定性

Theoretical uncertainties for cosmological first-order phase transitions

Djuna Croon, Oliver Gould, Philipp Schicho, Tuomas V. I. Tenkanen, Graham White

摘要:

我们严格审查的理论不确定性的大小微扰计算的一阶相变,使用标准模型有效场论作为我们的指导。在通常的菊花图的方法,我们发现大的不确定性,由于重整化尺度的依赖性,这相当于两到三个数量级的不确定性峰值引力波振幅,相关的实验,如LISA。或者,在更复杂的微扰方法中利用降维大大降低了这种尺度依赖性,将其推向更高阶。此外,这种方法解决了其他棘手的问题与菊花重新命名:它是规范不变的明确证明的标准模型,并避免了不受控制的衍生物膨胀的气泡成核率。

英文摘要:

We critically examine the magnitude of theoretical uncertainties in perturbative calculations of first-order phase transitions, using the Standard Model effective field theory as our guide. In the usual daisy-resummed approach, we find large uncertainties due to renormalisation scale dependence, which amount to two to three orders-of-magnitude uncertainty in the peak gravitational wave amplitude, relevant to experiments such as LISA. Alternatively, utilising dimensional reduction in a more sophisticated perturbative approach drastically reduces this scale dependence, pushing it to higher orders. Further, this approach resolves other thorny problems with daisy resummation: it is gauge invariant which is explicitly demonstrated for the Standard Model, and avoids an uncontrolled derivative expansion in the bubble nucleation rate.

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