3 ms·

I'd also add Recami's Tachyon Kinematics and Causality: A Systematic Thorough Analysis of the Tachyon Causal Paradoxes to the reading list. However, as this is

• raattgift 4y ago
  Thanks, added to the reading list. The 1980s typesetting is fun to see. Skimming quickly through, the Wheelerian text around eq (53) is fascinating, although I think I prefer an ADM-ish IV approach to thinking about the spacetime "suffering" from objects with these worldtubes, and thinking about the presence of a researcher reading a book by candlelight, all of which has worldlines similar to what is discussed in that part of Recami's paper. In that approach, a "Eulerian" snapshot observer notes two "copies" of the researcher on some slice, each with different candle-sizes and page numbers, while a more patient Eulerian observer may note one copy is reading backwards near a growing candle. However, Recami's consideration of a "Lagrangian" observer is certainly provocative if one starts to wonder what happens to his "traveller" across cosmological distances -- in that regime, one encounters arrow-of-time/statmech problems that sharpen in nonvacuum. (I will however need some time to absorb the points about apparent vacuum decay in Recami §7.7, among other goodies in the paper). Finally, yes, it was behind a paywall, but <https://sci-hub.se/https://link.springer.com/article/10.1007/BF00733092 https://sci-hub.se/https://link.springer.com/article/10.1007...> of course -- it's even easier to read that way, even if one has springerlink access. :-)