Timeline for In GR, how do particles know how to fall in instead of out of a gravitational well?
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| Jul 26, 2013 at 21:37 | comment | added | user4552 | What you have noticed implies that both solutions (in and out) are acceptable physical solutions. No, as explained in my answer, the reparametrization doesn't change an in-going geodesic to an out-going one. | |
| May 15, 2011 at 18:39 | history | answered | Francesco | CC BY-SA 3.0 |