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Constraints on extended-body motion in general relativity II

组织者

拉尔斯•安德森 , 黄双林 , 赵博文

演讲者

Abraham Harte

时间

2024年11月14日 16:30 至 17:30

地点

A3-2-301

线上

Zoom 559 700 6085 (BIMSA)

摘要

To a first approximation, objects in general relativity move along geodesics. Looked at more closely, a body's internal structure affects its motion, causing different objects to fall in different ways. This talk will explore what is possible and what is not in that context. For example, it is possible for a suitably-engineered spacecraft to drastically change its orbit purely by changing its shape. Still, there are constraints; not all orbital maneuvers are possible. I will discuss how constraints on extended-body motion arise from a very weak type of "local symmetry." This symmetry is associated with Killing vectors and with conformal Killing-Yano tensors, but from much more as well. There are qualitative differences in what is possible which depend on the Petrov type of background spacetime.