Timeline for Are there any ways to allow some form of FTL travel without allowing time travel?
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| Jul 14, 2016 at 2:35 | comment | added | a4android | @Hypnosifl Good questions. IMHO tachyons and bradyons should obey the same laws in all reference frames, Extended relativity assumed there will be sublight frames where tachyons are travelling backwards in time. I wonder if tachyons would appear in sublight frames. Ditto bradyons in SFR's. Some versions of the tachyon corridor have tachyons going to the past and future along a preferred spatial axis which prevents access to their past light cone. Making it causality violation free. | |
| Jul 13, 2016 at 14:34 | comment | added | Hypnosifl | @a4android - Even if the laws of physics governing tachyons would look the same in all superluminal reference frames, would tachyons appear to obey the same laws in all sublight inertial reference frames? How to avoid the conclusion that there are some sublight frames where tachyons travel backwards in time and others where they don't? Or is it in fact possible for tachyons to travel backwards in time in all frames, but only in some preferred spatial directions which prevents a two-way signal that would allow someone to communicate with their own past light cone? | |
| Jul 13, 2016 at 7:01 | comment | added | a4android | @Hypnosifl Antippa, Everett et al who developed the tachyon corridor were working with superluminal frames of reference (SFR). From their results physical laws are identical in all SFR's, but motion is always in a single increasing direction. This doesn't violate the first postulate of SR, it just bends it in a different direction. This means sublight and superluminal frames of reference are not exactly the same, but are complementary. Not the best explanation, but comments allow too few words. | |
| Jul 12, 2016 at 19:16 | comment | added | JDługosz | Yes, violating that is exactly the answer. | |
| Jul 11, 2016 at 16:19 | comment | added | Hypnosifl | The one-way FTL solution works, but I think it would violate the first postulate of special relativity which says the laws of physics should work identically in all inertial frames, since traveling FTL in one frame means traveling backwards in time in another, and if backwards time travel can happen in one frame the first postulate says it should be able to happen in all frames. | |
| Jul 11, 2016 at 9:06 | history | edited | a4android | CC BY-SA 3.0 |
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| Jul 11, 2016 at 5:10 | history | edited | a4android | CC BY-SA 3.0 |
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| Jul 11, 2016 at 5:00 | history | answered | a4android | CC BY-SA 3.0 |