In flat spacetime, say with special relativity, the Minkowski ST diagram
is easily understood with, say x and t being at rest, and x' and t'
tilted into the 1st quadrant at angles theta where tan(theta) = v/c.
Now, how does this diagram change (say , just the x and t axes) in the
presence of a spherical mass? Let's assume the schwartschild metric
applies. Do the tick marks on the axis change? Do they tilt?
thanks
J
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