论文标题
预热期间的预期反应
On the Expected Backreaction During Preheating
论文作者
论文摘要
在先前的工作中，我们认为，预测通货膨胀后预热的重力波信号的正确程序取决于形式主义。我们在此处扩展了先前的分析，以包括对充气运动和宇宙扩展产生的物质的反应，并研究后者如何影响所得引力波的光谱。反应的添加要求对不同期望值进行适当的重新归一化，我们通过以数值整合的方式保留差异不变性来正规化。相同的计算还使我们能够确定重新加热耦合物质的强度是成功的。我们用Starobinsky通货膨胀模型的标量版本说明了结果，并观察到很难在控制辐射校正的同时重新加热宇宙。
In previous work we argued that the correct procedure to predict the gravitational wave signal from preheating after inflation rests on the in-in formalism. We extend here our previous analysis to include the backreaction of the produced matter on the motion of the inflaton and the expansion of the universe, and study how the latter affect the spectrum of the resulting gravitational waves. The addition of backreaction demands the appropriate renormalization of divergent expectation values, which we regularize by preserving diffeomorphism invariance in a manner that is amenable to numerical integration. The very same calculation also allows us to determine for which strength of the inflaton to matter couplings reheating is successful. We illustrate our results with the scalar version of the Starobinsky model of inflation, and observe that it is hard to reheat the universe while keeping radiative corrections under control.
