Cosmological perturbations in non-local higher-derivative gravity
Cosmological perturbations in non-local higher-derivative gravity
复制标题
非局域高导数引力中的宇宙扰动
DOI：
10.1088/1475-7516/2014/11/022
复制
发表时间：
2014
影响因子：
6.4
通讯作者：
A. Koshelev
中科院分区：
文献类型：
--
作者：
B. Craps;T. Jonckheere;A. Koshelev
我们研究了由Biswas， Mazumdar和Siegel引入的非局部高导数引力模型中的宇宙学摄动。我们以三种方式扩展了以前的工作，这些工作主要关注余弦双曲弹跳解周围的经典标量扰动。首先，我们指出在这个模型中存在一个Starobinsky解，从现象学的角度来看，它更有吸引力（即使它没有反弹）。其次，我们研究了经典的矢量和张量超变换。第三，我们展示了如何量化德西特相位中的标量和张量扰动（对于参数的选择，使模型无鬼）。我们的结果表明，该模型在这一水平上表现良好，并且与局部f(R)模型的相应结果非常相似。特别地，对于非局部高导数引力的Starobinsky解，我们发现了与传统Starobinsky模型相同的张量标量比。
We study cosmological perturbations in a non-local higher-derivative model of gravity introduced by Biswas, Mazumdar and Siegel. We extend previous work, which had focused on classical scalar perturbations around a cosine hyperbolic bounce solution, in three ways. First, we point out the existence of a Starobinsky solution in this model, which is more attractive from a phenomenological point of view (even though it has no bounce). Second, we study classical vector and tensor pertuxsxrbations. Third, we show how to quantize scalar and tensor perturbations in a de Sitter phase (for choices of parameters such that the model is ghost-free). Our results show that the model is well-behaved at this level, and are very similar to corresponding results in local f(R) models. In particular, for the Starobinsky solution of non-local higher-derivative gravity, we find the same tensor-to-scalar ratio as for the conventional Starobinsky model.
f（r）理论。
影响因子：
40.6
作者：
De Felice A;Tsujikawa S
通讯作者：
Tsujikawa S