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arXiv 1503.04935hep-phhep-lat
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跨越电弱交叉的标准模型热力学

Standard Model thermodynamics across the electroweak crossover

M. Laine, M. Meyer

摘要:

即使希格斯质量mH = 125 GeV的标准模型没有体相变,它的热力学仍然在T = 160 GeV附近经历了一个“软点”,偏离了理想气体热力学。这种偏差可能会影响弱相互作用的暗物质遗迹丰度的精确计算,如果它们的质量是在几个TeV的范围内,或在这个温度范围内操作的leptogenesis方案。通过利用基于降维有效场论的晶格模拟结果,我们估计了交叉点的相关热力学函数。结果列表中的数值形式允许他们作为背景状态方程插入到宇宙粒子生产/去耦代码。我们发现,希格斯动力学诱导一个非平凡的“结构”可见,例如在热容量,但在一般情况下,最大的辐射修正源于QCD效应,减少了几个百分点的能量密度从自由值,即使在T > 160 GeV。

英文摘要:

Even though the Standard Model with a Higgs mass mH = 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.

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