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arXiv 1811.03310hep-th
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早期宇宙中Z玻色子和中微子的产生

Production of Z bosons and neutrinos in early universe

Cosmin Crucean

摘要:

研究了膨胀的de Sitter宇宙中Z玻色子和中微子的产生。本文用微扰方法建立了Z玻色子与轻子相互作用的跃迁振幅表达式。然后用解析的方法计算了Z玻色子、中微子和反中微子从真空中自发产生的振幅和几率,并用展开参数进行了图解分析。我们发现,这个过程的概率是非零的,只有在早期宇宙的大膨胀条件。我们讨论了Minkowski极限,得到在此极限下振幅为零,这一结果与Minkowski时空中真空的自发粒子产生被微扰过程中的能量和动量守恒所禁止这一公认的事实相对应.计算了该过程的总概率,并证明了该量仅对早期宇宙大膨胀的区域很重要,并且在闵可夫斯基极限处消失。

英文摘要:

Production of Z bosons and neutrinos is studied in the expanding de Sitter universe. The expression of the transition amplitudes in the case of Z boson interaction with leptons is established by using perturbative methods. Then the amplitude and probability for the spontaneous generation from vacuum of a Z boson a neutrino and an antineutrino are computed analytically and a graphical analysis is performed in terms of the expansion parameter. We found that the probability for this process is nonvanishing only for large expansion conditions of the early Universe. We discuss the Minkowski limit and obtain that in this limit the amplitude is zero, result which corresponds to the well established fact that spontaneous particle generation from vacuum in Minkowski space-time is forbidden by the simultaneous energy and momentum conservation in perturbative processes. The total probability of the process is computed and we prove that this quantity is important only for the regime of large expansion from early universe and is vanishing in the Minkowski limit.

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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