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arXiv 2103.07467hep-ph
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两圈阶的单态辅助电弱相变

Singlet-assisted electroweak phase transition at two loops

Lauri Niemi, Philipp Schicho, Tuomas V. I. Tenkanen

AI总结:

本文在标准模型实单态扩展中以两圈阶计算高温有效势及重求和,发现强相变参数相对单圈结果偏差显著,并给出可供格点研究的维数约化有效理论。

摘要:

我们在现有单圈研究的基础上,于两圈阶研究标准模型实单态扩展中的电弱相变。我们在高温近似下计算有效势,并详细说明两圈阶所需的重求和。在典型的强相变情景中,我们发现对于一步和两步相变,相变强度与临界温度相对单圈结果均存在约20%–50%的偏差。对于极强相变,其与单圈预测的差异甚至更大,这大概源于树态势中可观的标量耦合。在此过程中,我们获得了一个维数约化有效理论,可用于该模型的非微扰格点研究。

英文摘要:

We investigate the electroweak phase transition in the real-singlet extension of the Standard Model at two-loop level, building upon existing one-loop studies. We calculate the effective potential in the high-temperature approximation and detail the required resummations at two-loop order. In typical strong-transition scenarios, we find deviations of order $20\% - 50\%$ from one-loop results in transition strength and critical temperature for both one- and two-step phase transitions. For extremely strong transitions, the discrepancy with one-loop predictions is even larger, presumably due to sizable scalar couplings in the tree-level potential. Along the way, we obtain a dimensionally-reduced effective theory applicable for non-perturbative lattice studies of the model.

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。

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