标题： 自旋odal分解与膨胀：动力学和度规扰动 显示英文标题

标题： Spinodal Decomposition and Inflation: Dynamics and Metric Perturbations

摘要： 我们利用非平衡量子场论的闭合时间路径形式化方法结合非微扰Hartree近似，分析了暴胀宇宙学中的spinodal分解动力学。 除了通用分析外，我们还计算了两个特别重要的暴胀模型的详细演化：λΦ⁴新暴胀和自然暴胀。 我们在慢滚近似下计算了由暴胀相变产生的度规涨落，表明存在一个区域，在该区域内，inflaton场的量子涨落导致原始密度扰动谱的预测与标准结果有显著偏差。 我们提供了案例示例，其中功率谱的蓝倾斜（即n_s > 1）由单一inflaton场的演化引起，并证明场涨落可能导致波动的标量振幅显著低于标准预测，从而在一定程度上缓解了暴胀精细调节问题。 我们明确指出，由暴胀产生的度规扰动谱取决于暴胀阶段开始时的状态。 显示英文摘要

摘要： We analyse the dynamics of spinodal decomposition in inflationary cosmology using the closed time path formalism of out of equilibrium quantum field theory combined with the non-perturbative Hartree approximation. In addition to a general analysis, we compute the detailed evolution of two inflationary models of particular importance: lambda Phi^4 new inflation and natural inflation. We compute the metric fluctuations resulting from inflationary phase transitions in the slow roll approximation, showing that there exists a regime for which quantum fluctuations of the inflaton field result in a significant deviation in the predictions of the spectrum of primordial density perturbations from standard results. We provide case examples for which a blue tilt to the power spectrum (i.e. n_s > 1) results from the evolution of a single inflaton field, and demonstrate that field fluctuations may result in a scalar amplitude of fluctuations significantly below standard predictions, resulting in a slight alleviation of the inflationary fine tuning problem. We show explicitly that the metric perturbation spectrum resulting from inflation depends upon the state at the outset of the inflationary phase.