在多场充气中打开再热箱
Opening the reheating box in multifield inflation
摘要：
研究了多场暴胀对再加热物理的鲁棒性。为了进行这项研究，再加热详细描述的形式主义，它跟踪的演变的标量场和完美的流体相互作用（暴胀子及其衰变产物）。然后，这个框架被用来建立一般的运动方程的背景和微扰量控制系统的演变过程中再加热。接下来，这些方程精确地解决了一个新的数字代码。此外，新的分析技术，使我们能够解释和近似这些解决方案，开发。作为一个例子的物理预测，可能会受到影响的微观物理的再加热，非绝热扰动的幅度在双暴胀被认为是。结果发现，忽略再加热的精细结构，通常在标准的方法，可以导致差异大到$\sim 50\%$，而我们的半解析估计可以减少这个错误$\sim 10\%$。我们的结论是，在多场膨胀，通过再加热过程的细节跟踪扰动是很重要的，为了达到良好的精度，需要使用数值计算。
英文摘要：
The robustness of multi-field inflation to the physics of reheating is investigated. In order to carry out this study, reheating is described in detail by means of a formalism which tracks the evolution of scalar fields and perfect fluids in interaction (the inflatons and their decay products). This framework is then used to establish the general equations of motion of the background and perturbative quantities controlling the evolution of the system during reheating. Next, these equations are solved exactly by means of a new numerical code. Moreover, new analytical techniques, allowing us to interpret and approximate these solutions, are developed. As an illustration of a physical prediction that could be affected by the micro-physics of reheating, the amplitude of non-adiabatic perturbations in double inflation is considered. It is found that ignoring the fine-structure of reheating, as usually done in the standard approach, can lead to differences as big as $\sim 50\%$, while our semi-analytic estimates can reduce this error to $\sim 10\%$. We conclude that, in multi-field inflation, tracking the perturbations through the details of the reheating process is important and, to achieve good precision, requires the use of numerical calculations.
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