膨胀中非高斯性的简单计算方法
天体物理学
2009-11-10 v3
摘要
我们提出了一种简单的方法，用于在膨胀过程中计算非高斯性，通过在长波长上使用完全非线性方程，并利用随机源来考虑短波长的量子涨落。我们的形式化包括标量度量和物质扰动，二者合并为在长波长极限下对时间切片变化不变的变量。我们以单场慢滚情况下的扰动计算来说明此方法。我们还引入了一种方便的变量选择，用于图形方式呈现三点关联子的完整动量依赖性。
引用
@article{arxiv.astro-ph/0410486,
title = {Simple route to non-Gaussianity in inflation},
author = {G. I. Rigopoulos and E. P. S. Shellard and B. J. W. van Tent},
journal= {arXiv preprint arXiv:astro-ph/0410486},
year = {2009}
}
备注
6 pages, 2 figures. v2: Updated formalism to version described in astro-ph/0504508, leading to dropping of one unnecessary approximation. Final results not significantly changed. Extended discussion of calculation and added graphical presentation of full momentum dependence. References corrected and added. v3: Final version, only small textual changes