期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2015/01/012
关键词
inflation; cosmological perturbation theory; non-gaussianity; physics of the early universe
资金
- NASA ATP [NNX11AI95G]
- NSF CAREER Award [PHY-1145525]
- Kavli Institute for Cosmological Physics at the University of Chicago [NSF PHY-1125897]
- Robert R. McCormick Postdoctoral Fellowship
- Direct For Mathematical & Physical Scien
- Division Of Physics [1145525, 1125897] Funding Source: National Science Foundation
We derive novel identities satisfied by inflationary correlation functions in the limit where two external momenta are taken to be small. We derive these statements in two ways: using background-wave arguments and as Ward identities following from the fixed-time path integral. Interestingly, these identities allow us to constrain some of the O(q(2)) components of the soft limit, in contrast to their single-soft analogues. We provide several nontrivial checks of our identities both in the context of resonant non-Gaussianities and in small sound speed models. Additionally, we extend the relation at lowest order in external momenta to arbitrarily many soft legs, and comment on the many-soft extension at higher orders in the soft momentum. Finally, we consider how higher soft limits lead to identities satisfied by correlation functions in large-scale structure.
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