Timeline for What would be the least physics breaking way to travel at light speed or faster?
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20 events
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| Jun 26, 2022 at 14:25 | comment | added | Justin Thyme the Second | @Mon There is apparently no limit to the actual size of the quantum level, it can be theoretically as big as the universe, and it need not be transitory. It can be permanent if there is nothing 'outside' to interact. | |
| Jun 25, 2022 at 1:00 | comment | added | Mon | Justin Thyme; I've seen similar reports myself relating to issues like thermodynamics and the arrow of time. But the effects as reported while extremely interesting are (A) quantum level events and as such are extremely transitory in nature, entirely random and 'swamped' by the noise of all the other, more 'conventional' quantum interactions going on in that moment of space/time. And (B) Don't scale 'up' to the macro level. (Well not that we've ever noticed anyway.) And that's assuming they're 'real', not just theoretical. I'm not certain any of these effects have actually been observed yet. | |
| Jun 25, 2022 at 0:47 | comment | added | Mon | Justin Thyme; I've never seen any journals talking about what would a amount to closed WH i.e. a loop, if thats what your talking about. If its closed from the beginning causality is safe as nothing can enter and depending on how 'quickly' transit through a WH is the danger of getting caught inside is extremely slim. Firstly because on the macro scale it takes time for one end of the WH to travel away from and then back to the entry point. Also the closer it gets the less reason there is to use it in the first place. In any event its the relativistic V of the returning end thats the issue. | |
| Jun 24, 2022 at 16:13 | comment | added | Justin Thyme the Second | About causality - "Over the last decade, quantum physicists have been exploring the implications of a strange realization: In principle, both versions of the story can happen at once. That is, events can occur in an indefinite causal order, where both “A causes B” and “B causes A” are simultaneously true." quantamagazine.org/… | |
| Jun 24, 2022 at 14:24 | comment | added | Justin Thyme the Second | @Mon but if the one end of the WH is traveling wrt the entrance point, then something IN the WH will never be able to exit from it. Like the turtle can never pass the tortoise, the distance between them keeps infinitely diminishing by half. As soon as the object reaches the end, the end moves. | |
| Jun 23, 2022 at 12:08 | comment | added | Mon | Its a link to 'Wormholes', soft or otherwise. Since the entire concept is purely speculative in theory it doesn't really matter what conditions you place on their operation. But that said the majority of models, soft or otherwise generally define a specific set of circumstances/situations under which WH's would (in theory) breach causality. This leaves all other possible positioning options or starting conditions open to use. (But only if wormholes really exist of course). | |
| Jun 23, 2022 at 11:27 | comment | added | Daron | @Mon The link is about black holes and not soft wormholes. | |
| Jun 23, 2022 at 11:27 | comment | added | Daron | @Mon I didn't see your example of the ends moving relative to each other. That sounds like it would cause trouble. But I wonder can it happen in the first place for soft wormholes. | |
| Jun 22, 2022 at 23:08 | comment | added | Mon | Too hard to explain here. Try this (which is also a far future 'hard science'/SF world building website with lots of interesting ideas) orionsarm.com/page/322 | |
| Jun 22, 2022 at 13:19 | comment | added | Daron | @Mon What sort of conditions? | |
| Jun 22, 2022 at 12:25 | comment | added | Mon | user253751 I'm not a physicist but based on my research as I understand the problem the issue of causality 'breaches' only arises if certain specific conditions are met. (See my answer above). So it doesn't really matter if its a space ship or a sub-atomic particle we're talking about. 'If' the conditions required for a causality breach do not exist at the time a ship (or particle) transits a WH there's no problem. In effect there are very, very specific conditions that have to be met before a breach will occur. Avoid those conditions and (again in theory) you have a working FTL. (In theory) | |
| Jun 22, 2022 at 12:14 | comment | added | Mon | Daron, a little Googling will provide the answer. The usual example provided is the case of a WH where one 'end' of the a WH is accelerated away from the other until it reaches close to the speed of light. Time dilation at that 'end' then becomes significant. If the WH is then turned around and redirected back to a point where it's close to the other opening bizarre things could (in theory) happen. From the frame of reference of the 'high' speed ' end time dilation means an object entering the WH there could theoretically travel back in time (from its frame of reference). Hence the conflict. | |
| Jun 22, 2022 at 9:35 | comment | added | Daron | @Mon I don't follow how the wormholes could break causality. | |
| Jun 22, 2022 at 9:35 | comment | added | Daron | @JustinThymetheSecond It doesn't break causality to have the soft wormhole be faster than lightspeed along some other route | |
| Jun 22, 2022 at 8:30 | comment | added | Stack Exchange Supports Israel | @Mon if causality can be breached by spaceships it can also be breached by subatomic particles and it will do so all the time. | |
| Jun 22, 2022 at 3:44 | comment | added | Mon | Going on. As 'simple' solution to the dangers of a causality breach is to have the laws of physics themselves prevent them from happening i.e the laws of physics means that any attempt to breach causality using a wormhole cause the wormhole to collapse before causality can be violated. (Just don't be the one trying to travel traveling though the WH the instant it's tried.) So you could perhaps posit a network of WH that allow FTL be they man made or 'natural'. | |
| Jun 22, 2022 at 3:40 | comment | added | Mon | I believe the issue is causality not relativity. On face value all forms of FTL violate causality. But depending on the assumptions underpinning the type of FTL used and the interpretation of relativity chosen you can devise scenarios where causality is not broken. With wormholes the issues are the positioning of each end (relative to each other). How close they are and the velocity of one end (relative to the other) when an object travels through them. So if you avoid combos of position and velocity etc that break causality you can in theory use them for FTL travel. | |
| Jun 21, 2022 at 23:15 | comment | added | Justin Thyme the Second | There is no guarantee that traveling through a wormhole would take less time than going through normal space at c. This would preserve relativity. | |
| Jun 21, 2022 at 15:11 | history | edited | Daron | CC BY-SA 4.0 |
added 74 characters in body
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| Jun 21, 2022 at 14:54 | history | answered | Daron | CC BY-SA 4.0 |