2. Space-Time Diagrams
Description
This article is from the Relativity and FTL Travel FAQ, by Jason W. Hinson jason@physicsguy.com with numerous contributions by others.
2. Space-Time Diagrams
In this section we examine certain constructions known as space-time
diagrams. After a short look at why we need to discuss these diagrams, I
will explain what they are and what purpose they serve. Next we will
construct a space-time diagram for a particular observer. Then, using the
same techniques, we will construct a second diagram to represent the
coordinate system for a second observer who is moving with respect to the
first observer. This second diagram will show the second observer's frame of
reference with respect to the first observer; however, we will also switch
around the diagram to show what the first observer's frame of reference
looks like with respect to the second observer. Finally, we will compare the
concepts these two observers have of future and past, which will make it
necessary to first discuss a diagram known as a light cone.
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