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arXiv 1307.4451astro-ph.COgr-qchep-th
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对称暴胀

Symmetron Inflation

Ruifeng Dong, William H. Kinney, Dejan Stojkovic

摘要:

我们定义了一个新的暴胀场景,在大爆炸之后,当能量密度下降到某个临界值以下时,暴胀自然开始。作为一个模型,我们使用最近提出的介子场,其有效势依赖于环境的能量密度。在大爆炸之后的高密度状态下,介子的势能是微不足道的,场处于势能底部的平衡状态。当密度下降到某个临界值以下时,势的形状就会改变,成为对称性破缺势,场开始向下滚动。这种情况不需要任何特殊的初始条件来启动通货膨胀。我们还构造了一个具体的双场模型,即以介子为暴胀子,外加一个描述早期宇宙物质含量的标量场。对于最简单的耦合,功率谱的振幅和形状与单场慢卷暴胀中的相同。

英文摘要:

We define a new inflationary scenario in which inflation starts naturally after the Big Bang when the energy density drops below some critical value. As a model, we use recently proposed symmetron field whose effective potential depends on the energy density of the environment. At high densities, right after the Big Bang, the potential for the symmetron is trivial, and the field sits in equilibrium at the bottom of the potential. When the density drops below some critical value, the potential changes its shape into a symmetry breaking potential, and the field starts rolling down. This scenario does not require any special initial conditions for inflation to start. We also construct a concrete model with two fields, i.e. with symmetron as an inflaton and an additional scalar field which describes the matter content in the early universe. For the simplest coupling, the amplitude and shape of the power spectrum are the same as in the single field slow-roll inflation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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