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arXiv 0907.4303gr-qcastro-ph.COhep-phhep-th
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探测早期宇宙热引力波背景遗迹

Detecting relics of a thermal gravitational wave background in the early Universe

W. Zhao, D. Baskaran, P. Coles

摘要:

如果在通常的暴胀阶段之前有一个辐射主导的时期,那么在早期宇宙中就可以产生热引力波背景。这种背景为研究宇宙的初始状态提供了一种独特的方法。我们讨论了引力子的热谱对宇宙微波背景(CMB)功率谱的影响,以及它可能被CMB观测到。假设暴胀阶段是一个纯粹的de Sitter膨胀,我们发现,如果暴胀的e倍数小于65,这个热谱的信号可以通过普朗克和北极熊实验的观测,或计划中的EPIC实验检测到。如果类通货膨胀阶段是次指数阶段,这个界限甚至可以更宽松。

英文摘要:

A thermal gravitational wave background can be produced in the early Universe if a radiation dominated epoch precedes the usual inflationary stage. This background provides a unique way to study the initial state of the Universe. We discuss the imprint of this thermal spectra of gravitons on the cosmic microwave background (CMB) power spectra, and its possible detection by CMB observations. Assuming the inflationary stage is a pure de Sitter expansion we find that, if the number of e-folds of inflation is smaller than 65, the signal of this thermal spectrum can be detected by the observations of Planck and PolarBear experiments, or the planned EPIC experiments. This bound can be even looser if inflation-like stage is the sub-exponential.

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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