地点：中关村教学楼第四层 N413
主讲人：田佳
联系人：田佳
联系方式：15141873324
开始时间：2021-04-13 09:30
结束时间：2021-04-13 12:00
内容：
A well-behaved field theory living on a fixed background has a causality structure defined by the background metric. In holography, however, signals can travel through the bulk, and some bulk metrics would allow a signal to travel faster than the speed of light as seen on the boundary. These are called boundary causality violating metrics. Holographers usually work with a classical bulk metric, in which case they declare that boundary causality violating metrics are forbidden. However, in a full quantum gravity path integrals, these metrics do contribute. The question is then: how to avoid causality violation in this context? In this talk I will give a prescription that achieves this.