Bouncing Model in Brane World Theory
Bouncing Model in Brane World Theory
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DOI：
10.1103/physrevd.87.043528
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发表时间：
2013-01
影响因子：
5
通讯作者：
R. Maier;N. Pinto-Neto;I. Soares
中科院分区：
文献类型：
--
作者：
R. Maier;N. Pinto-Neto;I. Soares
本文在具有类时额外维的膜世界理论框架下研究了封闭Friedmann-Robertson-步行者宇宙的非线性动力学。在这种情况下，弗里德曼方程包含了由体膜相互作用产生的附加项，它为宇宙早期阶段的非奇异反弹提供了一个具体的模型。我们构建了一个由尘埃、辐射和宇宙常数构成的非奇异宇宙学场景。相空间的结构显示了一个非奇异轨道与两个加速阶段，分离的平滑过渡对应的减速膨胀。给定观测参数，我们将这些阶段连接到原始加速阶段，到弗里德曼的软过渡（经典制度是有效的），以及到德西特加速阶段的优雅退出。
We examine the nonlinear dynamics of a closed Friedmann-Robertson-Walker universe in the framework of Brane World formalism with a timelike extra dimension. In this scenario, the Friedmann equations contain additional terms arising from the bulk-brane interaction which provide a concrete model for nonsingular bounces in the early phase of the Universe. We construct a nonsingular cosmological scenario sourced with dust, radiation and a cosmological constant. The structure of the phase space shows a nonsingular orbit with two accelerated phases, separated by a smooth transition corresponding to a decelerated expansion. Given observational parameters we connect such phases to a primordial accelerated phase, a soft transition to Friedmann (where the classical regime is valid), and a graceful exit to a de Sitter accelerated phase.