Fermi Coordinates and Penrose Limits — mentioned by raattgift

Fri, 06 Sep 2024 13:39:52 GMT

> your velocity through time approaches zero Proper time, τ. But your proper time and my proper time are different, and are only coordinate times, monotonic labels on timelike curves. That means τ is an affine time. There are other affine times available. And we have to choose an affine time other than τ for null geodesics, the curves which photons (in vacuum) travel along. So, instead of proper time, for photons there's the affine parameter. The same rule applies: there is nothing special about the affine parameter. I don't have to use a photon's affine parameter when describing physics any…

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Fermi Coordinates and Penrose Limits · HackerPapers discussions

Fermi Coordinates and Penrose Limits — mentioned by raattgift