《时间旅行》的课堂引入与相对论解析

Introduction of 《Time Travel》in lecture and its relativity analysis

科教片《与霍金一起了解宇宙》之《时间旅行》从物理理论出发,通过假想实验和真实证据讨论了人类实现"时间旅行"的途径,非常适合相对论教学的课堂引入.本文根据相对论对其内容进行了深入分析和数据推证,并以片中环绕黑洞飞行和GPS为例探讨了强、弱引力场改变时间流速的计算方法,证明了弱场条件下可以直接利用狭义相对论时间膨胀和广义相对论引力钟慢效应的定量公式,其综合效果近似等于这两者结果的简单相加.

Science documentary 《Time Travel》 is outlined theoretically for realistic ideas of traveling through time. It is a good multi-media material for teaching relativity theory. Data in the film, such as to orbit the black hole and GPS, are demonstrated by using the theory of relativity. The calculation methods of time dilation under the strong and weak gravitational field are discussed. Under the weak field it can be directly used time dilation equation in special relativity and gravitational time dilation equation in general relativity. The comprehensive effect is equal to the sum of the above two results approximately.