The effective theory of shift-symmetric cosmologies
The effective theory of shift-symmetric cosmologies
复制标题
平移对称宇宙论的有效理论
DOI：
--
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Luca Santoni
中科院分区：
文献类型：
--
作者：
Bernardo Finelli;Garrett Goon;E. Pajer;Luca Santoni
A shift symmetry is a ubiquitous ingredient in inflationary models, both in effective constructions and in UV-finite embeddings such as string theory. It has also been proposed to play a key role in certain Dark Energy and Dark Matter models. Despite the crucial role it plays in cosmology, the observable, model independent consequences of a shift symmetry are yet unknown. Here, assuming an exact shift symmetry, we derive these consequences for single-clock cosmologies within the framework of the Effective Field Theory of Inflation. We find an infinite set of relations among the otherwise arbitrary effective coefficients, which relate non-Gaussianity to their time dependence. For example, to leading order in derivatives, these relations reduce the infinitely many free functions in the theory to just a single one. Our Effective Theory of shift-symmetric cosmologies describes, among other systems, perfect and imperfect superfluids coupled to gravity and driven superfluids in the decoupling limit. Our results are the first step to determine observationally whether a shift symmetry is at play in the laws of nature and whether it is broken by quantum gravity effects.
影响因子：
6.5
作者：
Ade, P. A. R.;Aghanim, N.;Zonca, A.
通讯作者：
Zonca, A.
暴胀 EFT 中时空微分同胚断裂的独特特征
影响因子：
6.4
作者：
Bartolo N
通讯作者：
Bartolo N