Gravitational Effects on Inflaton Decay
Gravitational Effects on Inflaton Decay
复制标题
引力对暴胀子衰变的影响
DOI：
10.1088/1475-7516/2015/05/038
复制
发表时间：
2015
期刊：
影响因子：
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通讯作者：
K.Nakayama
中科院分区：
文献类型：
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作者：
Y.Ema;R.Jinno;K.Mukaida;K.Nakayama
我们指出，膨胀子不可避免地通过哈勃参数或宇宙标度因子的振荡而与所有非共形耦合物质产生引力耦合。它会导致在膨胀后最有效的充气振荡过程中产生粒子。此外，将分析推广到具有非最小膨胀耦合到重力的模型，其中哈勃参数的振荡更剧烈。我们将我们的结果应用于膨胀产生的引力子：重力子也是在膨胀之后产生的，但非最小耦合并不会导致膨胀子衰变成引力子对。
We point out that the inflaton inevitably couples to all non-conformally coupled matters gravitationally through an oscillation in the Hubble parameter or the cosmic scale factor. It leads to particle production during the inflaton oscillation regime, which is most efficient just after inflation. Moreover, the analysis is extended to the model with non-minimal inflaton couplings to gravity, in which the Hubble parameter oscillates more violently. We apply our results to the graviton production by the inflaton: gravitons are also produced just after inflation, but the non-minimal coupling does not induce inflaton decay into the graviton pair.