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arXiv 0710.3429hep-thastro-phhep-ph
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弦论中的轴子暴胀和重力波

Axion Inflation and Gravity Waves in String Theory

Renata Kallosh, Navin Sivanandam, Masoud Soroush

备注：
30 + 16 pages, 5 figures. Added references, corrected typos
发表信息：
Phys.Rev.D77:043501,2008
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摘要：

弦论中的大多数暴胀模型都预言不存在可测量的引力波，r << 10^{-3}。最有前途的建议，使弦理论模型，产生可测量的张量波动涉及轴子场略有破缺的移位对称性。我们认为这样的模型详细，特别关注的N-通货膨胀的情况下，轴子谷/自然通货膨胀模型。我们发现，在Calabi-Yau三重紧化与对数Kahler势K，它似乎是很难满足所需的条件，在超引力制度的轴子膨胀。然而，在具有（近似）二次移位对称K的超引力中，轴子膨胀可能是可行的。在某些弦模型中，在模空间的特定极限中，这种Kahler势确实会出现。我们描述了最有前途的模型类别;在得出工作模型存在的结论之前，需要进行更详细的研究。

英文摘要：

The majority of models of inflation in string theory predict an absence of measurable gravitational waves, r << 10^{-3}. The most promising proposals for making string theoretic models that yield measurable tensor fluctuations involve axion fields with slightly broken shift symmetry. We consider such models in detail, with a particular focus on the N-flation scenario and on axion valley/natural inflation models. We find that in Calabi-Yau threefold compactifications with logarithmic Kahler potentials K it appears to be difficult to meet the conditions required for axion inflation in the supergravity regime. However, in supergravities with an (approximately) quadratic shift-symmetric K, axion inflation may be viable. Such Kahler potentials do arise in some string models, in specific limits of the moduli space. We describe the most promising classes of models; more detailed study will be required before one can conclude that working models exist.

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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