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arXiv 0904.2835hep-thastro-ph.COgr-qchep-ph
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Horava-Lifshitz宇宙学中的物质反弹

Matter Bounce in Horava-Lifshitz Cosmology

Robert Brandenberger

摘要:

Horava-Lifshitz引力,一个最近提出的UV完全可重整引力理论,可能会导致一个反弹的宇宙学。在本文中,我们认为Horava-Lifshitz宇宙学可能会产生一个具体的实现的物质反弹的情况下,从而产生一个替代暴胀产生的尺度不变谱的宇宙学扰动。在这种情况下,量子真空涨落在反弹前阶段离开哈勃半径,并且在反弹之前光谱被转换成超哈勃尺度上的尺度不变光谱,因为长波长模式比短波长模式经历更长时间的波函数压缩。曲率波动谱的尺度不变性在反弹期间和之后被保留。这种情况的一个独特的预测是双谱的幅度和形状。

英文摘要:

Horava-Lifshitz gravity, a recent proposal for a UV-complete renormalizable gravity theory, may lead to a bouncing cosmology. In this note we argue that Horava-Lifshitz cosmology may yield a concrete realization of the matter bounce scenario, and thus give rise to an alternative to inflation for producing a scale-invariant spectrum of cosmological perturbations. In this scenario, quantum vacuum fluctuations exit the Hubble radius in the pre-bounce phase and the spectrum is transformed into a scale-invariant one on super-Hubble scales before the bounce because the long wavelength modes undergo squeezing of their wave-functions for a longer period of time than shorter wavelength modes. The scale-invariance of the spectrum of curvature fluctuations is preserved during and after the bounce. A distinctive prediction of this scenario is the amplitude and shape of the bispectrum.

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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