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arXiv 0906.4520astro-ph.CO
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早期宇宙在QCD相变时的一点暴胀

A little inflation in the early universe at the QCD phase transition

Tillmann Boeckel, Jurgen Schaffner-Bielich

摘要:

我们探讨了一种在早期宇宙中重子数不可忽略时允许QCD强一级相变的情形及其可能的宇宙学可观测结果。主要的假设是一个准稳定的QCD真空态,它会导致短时间的暴胀,从而将净重子光子比稀释到今天的观测值。重子生成需要一个强有力的机制,以一个有序统一的重子不对称性开始,例如阿弗莱克-戴恩重子生成。宇宙学意义是,在1 - 10个太阳质量的暗物质质量尺度下,对原始密度波动的直接影响,在10^6 - 10^8个太阳质量的质量尺度下,光谱斜率的变化,产生初始强度高达10^12高斯的原始磁场和现今峰值应变振幅至多为h_c = 5 * 的引力波谱频率为4*10^-8 Hz时,小量子色动力学暴胀的情况可以用即将在达姆施塔特GSI的重离子研究设施FAIR来探测。

英文摘要:

We explore a scenario that allows for a strong first order phase-transition of QCD at non-negligible baryon number in the early universe and its possible cosmological observable consequences. The main assumption is a quasi-stable QCD-vacuum state that leads to a short period of inflation, consequently diluting the net baryon to photon ratio to it's today observed value. A strong mechanism for baryogenesis is needed to start out with a baryon asymmetry of order unity, e.g. as provided by Affleck-Dine baryogenesis. The cosmological implications are direct effects on primordial density fluctuations up to dark matter mass scales of 1 - 10 solar masses, change in the spectral slope up to mass scales of 10^6 - 10^8 solar masses, production of primordial magnetic fields with initial strength up to 10^12 Gauss and a gravitational wave spectrum with present day peak strain amplitude of at most h_c = 5 * 10^-15 around a frequency of 4*10^-8 Hz. The little QCD inflation scenario could be probed with the upcoming heavy ion research facility FAIR at GSI, Darmstadt.

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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