On adiabatic invariant in generalized Galileon theories
On adiabatic invariant in generalized Galileon theories
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DOI：
10.1088/1475-7516/2015/10/049
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发表时间：
2015-05
影响因子：
6.4
通讯作者：
Yohei Ema;Ryusuke Jinno;K. Mukaida;K. Nakayama
中科院分区：
文献类型：
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作者：
Yohei Ema;Ryusuke Jinno;K. Mukaida;K. Nakayama
我们在暴胀的背景下考虑广义伽利略理论的背景动力学，其中引力和暴胀子相互非最小耦合。在暴胀子振荡区域，与具有最小耦合暴胀子的爱因斯坦引力不同，在很多情况下哈勃参数和能量密度会剧烈振荡。然而，我们发现在任何广义伽利略理论的暴胀子振荡区域都存在一个绝热不变量。这个绝热不变量在估算宇宙的膨胀规律以及由于哈勃参数振荡导致的粒子产生率方面是有用的。
We consider background dynamics of generalized Galileon theories in the context of inflation, where gravity and inflaton are non-minimally coupled to each other. In the inflaton oscillation regime, the Hubble parameter and energy density oscillate violently in many cases, in contrast to the Einstein gravity with minimally coupled inflaton. However, we find that there is an adiabatic invariant in the inflaton oscillation regime in any generalized Galileon theory. This adiabatic invariant is useful in estimating the expansion law of the universe and also the particle production rate due to the oscillation of the Hubble parameter.