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arXiv 2005.11332hep-phhep-lat
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两步电弱相变的热力学

Thermodynamics of a two-step electroweak phase transition

Lauri Niemi, Michael J. Ramsey-Musolf, Tuomas V. I. Tenkanen, David J. Weir

摘要:

在粒子物理学的标准模型之外,新的场内容可以改变早期宇宙中电弱对称性破缺的热历史。特别地,对称性破缺可能已经通过一系列连续的相变发生。我们在标准模型的实三重态扩展中,用非微扰格子模拟研究了这种情形的热力学。在一个狭窄的参数空间范围内发现了两步电弱相变,第二次相变总是一级相变。在两步参数空间的不可忽略的部分中,第一次过渡到非零三重态真空期望值的阶段是一阶的。与2回路微扰计算的比较和显着的差异与非微扰的结果被确定。

英文摘要:

New field content beyond that of the Standard Model of particle physics can alter the thermal history of electroweak symmetry breaking in the early universe. In particular, the symmetry breaking may have occurred through a sequence of successive phase transitions. We study the thermodynamics of such scenario in a real triplet extension of the Standard Model, using nonperturbative lattice simulations. Two-step electroweak phase transition is found to occur in a narrow region of allowed parameter space with the second transition always being first order. The first transition into the phase of non-vanishing triplet vacuum expectation value is first order in a non-negligible portion of the two-step parameter space. A comparison with 2-loop perturbative calculation is provided and significant discrepancies with the nonperturbative results are identified.

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