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arXiv 1005.4053astro-ph.COhep-phhep-th
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混合暴胀中瀑布场的大尺度扰动

Large-scale Perturbations from the Waterfall Field in Hybrid Inflation

José Fonseca, Misao Sasaki, David Wands

摘要:

除了通常的暴胀子场扰动外,我们还估计了混合暴胀期间瀑布场等曲率波动的大尺度曲率扰动。在暴胀结束时的快子不稳定性导致了超哈勃尺度扰动的爆炸性增长,但它们保留了暴胀期间大质量场中真空涨落的陡峭蓝色光谱特征。因此,在暴胀结束时,功率谱在哈勃视界尺度附近达到峰值。我们扩展了通常的delta-N形式主义,包括这些小的波动时,估计大规模的曲率扰动的重要作用。由于瀑布场的波动而产生的曲率扰动是二阶的,预计光谱在宇宙学尺度上为10^{-54}阶。

英文摘要:

We estimate large-scale curvature perturbations from isocurvature fluctuations in the waterfall field during hybrid inflation, in addition to the usual inflaton field perturbations. The tachyonic instability at the end of inflation leads to an explosive growth of super-Hubble scale perturbations, but they retain the steep blue spectrum characteristic of vacuum fluctuations in a massive field during inflation. The power spectrum thus peaks around the Hubble-horizon scale at the end of inflation. We extend the usual delta-N formalism to include the essential role of these small fluctuations when estimating the large-scale curvature perturbation. The resulting curvature perturbation due to fluctuations in the waterfall field is second-order and the spectrum is expected to be of order 10^{-54} on cosmological scales.

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