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Robert McNees (mcnees@mastodon.social)'s status on Tuesday, 07-Nov-2023 18:34:09 UTC Robert McNees

Radial light rays and causal structure of the Schwarzschild black hole, plotted in Eddington-Finkelstein coordinates, for the relativity students.
Need to redo this in PGF/TikZ!
In conversation about a year ago from mastodon.social permalink
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1. A plot showing radial geodesics of the Schwarzschild black hole, in Eddington-Finkelstein coordinates that are well-suited to describing the entire spacetime outside the singularity. The ingoing geodesics v = constant are shown as blue lines. The geodesics 2 dr - V(r) dv = 0 are shown as red curves. Outside r = 2MG they are outgoing, inside r=2MG they are ingoing. Looking at the intersection of these blue and red curves, you can see how the light cones at a point tilt as one approaches r = 2MG. Inside this region the light cones are tilted so that the causal paths followed by any observer lead inexorably inward.
  https://files.mastodon.social/media_attachments/files/111/370/701/446/083/159/original/bf590404ae21fe8a.png
- Canageek (canageek@wandering.shop)'s status on Tuesday, 07-Nov-2023 19:39:03 UTC Canageek
  in reply to
  
  @mcnees very cool, have you ever looked at the pgfplots package? it's a abstraction layer on top of pgf/TikZ that is very easy to plot things like this in
  
  In conversation about a year ago permalink
- Robert McNees (mcnees@mastodon.social)'s status on Tuesday, 07-Nov-2023 19:39:03 UTC Robert McNees
  in reply to
  - Canageek
  @Canageek Oh yeah, I've used it many times, though typically I do these things with pure pgf/TikZ.
  
  In conversation about a year ago permalink

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