The epochs of reheating and preheating are studied in a simple extension ofthe Starobinsky inflationary model, which consists of an $R^2$--correction tothe Einstein--Hilbert action and an additional scalar field. We find that ifthe $R^2$--correction at the end of inflation is dynamically important, itaffects the expansion rate and as a consequence the reheating and preheatingprocesses. While we find that the reheating temperature and duration ofreheating are only slightly affected, the effect has to be taken into accountwhen comparing the theory to data. In the case of preheating, the gravitationalcorrections can significantly affect the decay of the second field. Particleproduction is strongly affected for certain values of the parameters in thetheory.
展开▼
机译：在Starobinsky通货膨胀模型的简单扩展中研究了再加热和预热的时期，该模型包括对爱因斯坦-希尔伯特作用的$ R ^ 2 $校正和一个附加的标量场。我们发现，如果通货膨胀结束时的$ R ^ 2 $-校正在动态上很重要，则它会影响膨胀率，从而影响再加热和预热过程。尽管我们发现再加热温度和再加热持续时间仅受到很小的影响，但是在将理论与数据进行比较时必须考虑到这种影响。在预热的情况下，重力校正会显着影响第二场的衰减。对于理论中某些参数值，粒子生成会受到很大影响。
展开▼
