标题： 预热与分数幂 显示英文标题

标题： Preheating with Fractional Powers

摘要： 我们研究了预加热现象在标量场势能由分数幂给出的模型中的情形，这种情况出现在轴子单色炎模型中。我们假设标量场与轴子场之间存在标准耦合。我们发现尽管标量场围绕势能最小值振荡是非谐振的，仍然存在参数共振不稳定性，并且我们确定了描述这种不稳定性随标量场势能参数变化的弗洛凯指数。 显示英文摘要

摘要： We consider preheating in models in which the potential for the inflaton is given by a fractional power, as is the case in axion monodromy inflation. We assume a standard coupling between the inflaton field and a scalar matter field. We find that in spite of the fact that the oscillation of the inflaton about the field value which minimizes the potential is anharmonic, there is nevertheless a parametric resonance instability, and we determine the Floquet exponent which describes this instability as a function of the parameters of the inflaton potential.