Standard Model thermodynamics across the electroweak crossover
Standard Model thermodynamics across the electroweak crossover
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DOI：
10.1088/1475-7516/2015/07/035
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发表时间：
2015-07-01
影响因子：
6.4
通讯作者：
Meyer, M.
中科院分区：
文献类型：
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作者：
Laine, M.;Meyer, M.
尽管希格斯质量m(H) = 125 GeV的标准模型没有体相变，但它的热力学在T = 160 GeV附近仍然经历了一个“软点”，与理想气体热力学存在偏差。这种偏差可能会影响弱相互作用暗物质遗迹丰度的精确计算，如果它们的质量在几TeV范围内，或者在这个温度范围内运行的轻生情景。通过利用基于降维有效场论的晶格模拟结果，我们估计了跨交叉的相关热力学函数。结果以数值形式列示，允许它们作为背景状态方程插入到宇宙粒子产生/解耦代码中。我们发现希格斯动力学诱导了一个非寻常的“结构”，例如在热容中可见，但通常最大的辐射修正来自QCD效应，即使在t> - 160 GeV时，能量密度也比自由值降低了几个百分点。
Even though the Standard Model with a Higgs mass m(H) = 125 GeV possesses no bulk phase transition, its thermodynamics still experiences a "soft point" at temperatures around T = 160 GeV, with a deviation from ideal gas thermodynamics. Such a deviation may have an effect on precision computations of weakly interacting dark matter relic abundances if their mass is in the few TeV range, or on leptogenesis scenarios operating in this temperature range. By making use of results from lattice simulations based on a dimensionally reduced effective field theory, we estimate the relevant thermodynamic functions across the crossover. The results are tabulated in a numerical form permitting for their insertion as a background equation of state into cosmological particle production/decoupling codes. We find that Higgs dynamics induces a non-trivial "structure" visible e.g. in the heat capacity, but that in general the largest radiative corrections originate from QCD effects, reducing the energy density by a couple of percent from the free value even at T > 160 GeV.