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arXiv 1105.0832astro-ph.CO
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宇宙学QCD相变时的一点暴胀

A little inflation at the cosmological QCD phase transition

Tillmann Boeckel, Jürgen Schaffner-Bielich

摘要:

我们重新研究了最近提出的“小暴胀”方案,该方案允许在早期宇宙中重子数不可忽略的情况下发生强的QCD一级相变及其可能的可观测后果。该方案是基于一个强大的重子生成机制和准稳定的QCD介质状态的假设,引发了一个短的通货膨胀期的通货膨胀稀释重子不对称的值今天观察到的。宇宙学的影响进行了重新审查,即原始密度波动的影响,暗物质质量尺度的$M_{max} \sim 1 M_{\astrosun}$,光谱斜率的变化,$M_{max} \sim 10^6 M_{\astrosun}$,种子生产目前的银河系和河外磁场和引力波的峰值频率约$ν_{peak} \sim 4 \cdot 10^{-8} Hz$。我们更详细地讨论了成核的问题,并采用QCD的手征有效模型来研究成核对小尺度结构形成的影响。

英文摘要:

We reexamine the recently proposed "little inflation" scenario that allows for a strong first order phase-transition of QCD at non-negligible baryon number in the early universe and its possible observable consequences. The scenario is based on the assumptions of a strong mechanism for baryogenesis and a quasistable QCD-medium state which triggers a short inflationary period of inflation diluting the baryon asymmetry to the value observed today. The cosmological implications are reexamined, namely effects on primordial density fluctuations up to dark matter mass scales of $M_{max} \sim 1 M_{\astrosun}$, change in the spectral slope up to $M_{max} \sim 10^6 M_{\astrosun}$, production of seeds for the present galactic and extragalactic magnetic fields and a gravitational wave spectrum with a peak frequency around $ν_{peak} \sim 4 \cdot 10^{-8} Hz$. We discuss the issue of nucleation in more detail and employ a chiral effective model of QCD to study the impact on small scale structure formation.

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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