Stochastic approach to flat direction during inflation
Stochastic approach to flat direction during inflation
复制标题
通货膨胀期间平坦方向的随机方法
DOI：
10.1088/1475-7516/2012/08/031
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发表时间：
2012
影响因子：
6.4
通讯作者：
Tomohiro Takesako
中科院分区：
文献类型：
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作者：
T. Fujita;M. Kawasaki;Y. Tada and T. Takesako;Tomohiro Takesako;Tomohiro Takesako
我们重新审视了暴胀期间平坦和非平坦方向系统的时间演化。为了在分析中考虑量子噪声的影响，我们基于随机形式，数值求解耦合朗之万方程。我们专注于一类模型，其中树级哈勃引起的质量不产生。虽然原则上非平坦方向可以阻止平坦方向方差的增长，但非平坦方向的有效质量抑制了这种阻止效应。我们发现，在暴胀过程中的平坦方向的命运是由单圈辐射校正和不可重正化的条款，通常认为，如果我们删除的零点波动的噪声项。
We revisit the time evolution of a flat and non-flat direction system during inflation. In order to take into account quantum noises in the analysis, we base on stochastic formalism and solve coupled Langevin equations numerically. We focus on a class of models in which tree-level Hubble-induced mass is not generated. Although the non-flat directions can block the growth of the flat direction's variance in principle, the blocking effects are suppressed by the effective masses of the non-flat directions. We find that the fate of the flat direction during inflation is determined by one-loop radiative corrections and non-renormalizable terms as usually considered, if we remove the zero-point fluctuation from the noise terms.