期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 9, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2010/09/012
关键词
inflation; cosmological perturbation theory; cosmological phase transitions
资金
- Fundacao para a Ciencia e a Tecnologia (Portugal) [SFRH/BD/40150/2007]
- STFC
- JSPS [21244033, 19GS0219]
- Kyoto University
- Fundação para a Ciência e a Tecnologia [SFRH/BD/40150/2007] Funding Source: FCT
- Science and Technology Facilities Council [ST/H002774/1] Funding Source: researchfish
- STFC [ST/H002774/1] Funding Source: UKRI
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据