Stochastic inflation in a simple two-field model.
Stochastic inflation in a simple two-field model.
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简单两场模型中的随机通货膨胀。
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
F. Lucchin
中科院分区：
文献类型：
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作者：
S. Mollerach;S. Matarrese;A. Ortolan;F. Lucchin
在随机方法的框架下，考虑了暴胀过程中的非支配标量场的动力学，其中它的运动和暴胀子的运动由两个耦合的朗之万方程描述。由暴胀子引起的曲率扰动使问题成为随机介质中布朗运动的问题。在幂律暴胀中，由具有指数势的暴胀子驱动的自由无质量场求解了相关的福克-普朗克方程：这个简单的模型可以描述在暴胀期间轴子或任何其他伪戈德斯通玻色子的动力学
The dynamics of a nondominating scalar field during inflation is considered in the framework of the stochastic approach where its motion and that of the inflaton are described by two coupled Langevin equations. Curvature perturbations induced by the inflaton make the problem that of a Brownian motion in a random medium. The associated Fokker-Planck equation is solved for a free massless field in a power-law inflation driven by an inflaton with an exponential potential : this simple model could describe the dynamics of the axion, or any other pseudo Goldstone boson, during inflation