地点：腾讯会议 973-6909-6865
主讲人：Anna Tokareva （帝国理工）
联系人：孟老师
联系方式：13520957347
开始时间：2022-10-17 16:00:00
结束时间：2022-10-17 17:00:00
内容：
腾讯会议链接: https://meeting.tencent.com/dm/ZGVDkboF0pFP
Abstract:
Gravity can be embedded into a renormalizable theory by means of adding quadratic in curvature terms. However, this at first leads to the presence of the Weyl ghost. It is possible to get rid of this ghost if the locality assumption is weakened and the propagator of the graviton is represented by an entire function of the d'Alembertian operator without new poles and zeros. Models of this type admit a cosmological solution describing the R^2, or Starobinsky, inflation. We study graviton production after inflation in this model and show that it is negligible despite the presence of the higher derivative operators which could potentially cause instabilities.