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首页> 外文期刊>Physics Letters, B. Nuclear Physics and High Energy Physics >Primordial bouncing cosmology in the Deser-Woodard nonlocal gravity
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Primordial bouncing cosmology in the Deser-Woodard nonlocal gravity

机译：在沙漠木马的原始弹跳宇宙中的非局部重力

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The Deser-Woodard (DW) nonlocal gravity model has been proposed in order to describe the late-time acceleration of the universe without introducing dark energy. In this paper we focus, however, on the early stage of the universe and demonstrate how a primordial bounce in the vacuum spacetime can be realized in the framework of the DW nonlocal model. We reconstruct the nonlocal distortion function, which encodes all the modifications to the Einstein-Hilbert action, in order to generate bouncing solutions to solve the initial singularity problem. We show that the initial conditions can be chosen in such a way that the distortion function and its first order derivative approach zero after the bounce and the standard cosmological solution described by general relativity is recovered afterwards. We also study the evolution of anisotropies near the bounce. It turns out that the shear density defined by the anisotropy grows towards the bounce, but due to the presence of nonlocal effects, it grows in a milder manner compared with that in Einstein gravity. (C) 2019 The Author(s). Published by Elsevier B.V.
机译：已经提出了Deser-Woodard（DW）非局部重力模型，以描述宇宙的后期加速而不引入暗能。然而，在本文中，我们专注于宇宙的早期阶段，并展示了在DW非本体模型的框架中实现了真空空间中的原始反弹。我们重建非识别失真函数，该函数对EINSTEIN-HILBERT动作进行了所有修改，以便生成突出解决方案以解决初始奇点问题。我们表明，之后，可以以这样的方式选择初始条件，使得之后的失真功能及其第一阶数衍生物接近零是归零的通用相对性描述的标准宇宙学求解。我们还研究了反弹附近的各向异性的演变。事实证明，由各向异性定义的剪切密度向反弹增长，但由于存在非局部效应的存在，与爱因斯坦重力相比，它以较高的方式增长。 （c）2019年作者。由elsevier b.v出版。

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