报告题目 | Spacetime in Superposition |
报告人 | Robert B. Mann 教授 |
报告人单位 | 滑铁卢大学 |
报告时间 | 2024-11-01 (周五) 10:00 |
报告地点 | 上海研究院4号楼329报告厅(合肥物质楼B1102同步视频) |
主办单位 | 中国科学院量子信息与量子科技创新研究院 |
报告介绍 | 报告摘要:If relativistic gravitation has a quantum description, it must be meaningful to consider a spacetime metric in a genuine quantum superposition. But how might such a superposition be described, and how could observers detect it? I will present a new operational framework for studying “superpositions of spacetimes” via model particle detectors. After presenting the general approach, I show how it can be applied to describe a spacetime generated that is a superposition of two expanding spacetimes. I will then move on to show how black holes in two spatial dimensions can be placed in a superposition of masses and how such detectors would respond. The response exhibits signatures of quantum-gravitational effects reminiscent of Bekenstein’s seminal conjecture concerning the quantized mass spectrum of black holes in quantum gravity. I will provide further remarks concerning the meaning of the spacetime metric, and on distinguishing spacetime superpositions that are genuinely quantum-gravitational, closing with suggestions as to how these ideas might be implemented in a laboratory setting. |