Revisiting the cosmological coherent oscillation
Revisiting the cosmological coherent oscillation
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重温宇宙相干振荡
DOI：
10.1103/physrevd.87.023513
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发表时间：
2013
影响因子：
5
通讯作者：
中山和則
中科院分区：
文献类型：
--
作者：
川崎雅裕;北嶋直弥;中山和則
通常情况下，标量场在早期宇宙中以相干振荡的形式产生。这些标量场可能具有巨大的丰度并影响宇宙的演化。特别是，如果生命周期足够长，它们可能会造成宇宙灾难。我们重新审视标量场与另一个振荡标量场耦合时的相干振荡问题，发现一种情况是，一种变体类型的绝热抑制机制显着降低了振荡的丰度或振幅。作为一个具体的例子，它被应用于萨克子（超对称轴子模型中的平面方向），我们表明宇宙学萨克子问题在特定的设置中得到了解决。
It is often the case that scalar fields are produced in the early Universe in the form of coherent oscillation. These scalar fields may have huge abundances and affect the evolution of the Universe. In particular, if <?format ?>the lifetime is long enough, they may cause cosmological disasters. We revisit the issue of coherent oscillation of the scalar field when it couples with another oscillating scalar field, and find a situation that the abundance, or the amplitude of the oscillation, is significantly reduced by a variant type of the adiabatic suppression mechanism. As a concrete example, it is applied to the saxion, a flat direction in the supersymmetric axion model, and we show that the cosmological saxion problem is solved in a particular setup.