Enhanced non-Gaussianity from excited initial states

被引:226
|
作者
Holman, R. [1 ]
Tolley, Andrew J. [2 ]
机构
[1] Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA
[2] Perimeter Inst Theoret Phys, Waterloo, ON N2L 2Y5, Canada
来源
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2008年 / 05期
关键词
cosmological perturbation theory; inflation; quantum field theory on curved space; physics of the early universe;
D O I
10.1088/1475-7516/2008/05/001
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We use the techniques of effective field theory in an expanding universe to examine the effect of choosing an excited inflationary initial state built over the Bunch - Davies state on the CMB bi-spectrum. We find that, even for Hadamard states, there are unexpected enhancements in the bi-spectrum for certain configurations in momentum space due to interactions of modes in the early stages of inflation. These enhancements can be parametrically larger than the standard ones and are potentially observable in future data. These initial state effects have a characteristic signature in l-space which distinguishes them from the usual contributions, with the enhancement being most pronounced for con. gurations corresponding to flattened triangles for which two momenta are collinear.
引用
收藏
页数:27
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