论文标题
宇宙学一阶相变的理论不确定性
Theoretical uncertainties for cosmological first-order phase transitions
论文作者
论文摘要
我们使用标准模型有效的现场理论作为我们的指南，批判性地检查了一阶相变的扰动计算中理论不确定性的幅度。在通常的雏菊示点方法中，我们发现由于重量量量标准量的依赖性而引起的大不确定性，在峰值引力波振幅中，这相当于与LISA等实验有关的峰值引力波振幅中的两到三个不确定性。另外，利用更复杂的扰动方法中的尺寸降低会大大降低这种规模的依赖性，从而将其推向更高的订单。此外，这种方法解决了雏菊重新调整的其他棘手问题：它是规范不变的，对于标准模型明确证明，并避免了气泡成核速率中不受控制的导数扩展。
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.
