Time travel from our perspective is impossible. What people talk about when discussing wormholes affecting things before they've happened are on a quantum level.
Quantum particles decay and change and do stuff to each other and to understand it you need an equation to explain that, but some of those equations require the state of those decayed particles to provide their state to earlier parts of the equation, before they were created through quantum decay or their state determined by waveform collapse. This is sometimes described as time travel but it's not really, time has no relevance at that level of understanding. WE live in space-time and quantum physics is the foundation of that fabric. So the solution doesn't really violate the laws of time, it happens in a place where space and time don't have the same relevance.
If you somehow did create a feedback loop in this situation we'd never know. The concepts of it taking forever or being instantaneously resolved don't apply, because as far as we're concerned we only get the end product. We're not even sure of coherence is a good way of telling how much work has been done in a twisty, strange quantum problem like that.
I mention coherence because at the quantum level it's the only way of knowing which direction everything is happening in. It's not the same as time, but it's a bit more like very very fast entropy at a quantum level.
All of these things come together to give you space-time.
So when we talk about wormholes we're talking about the transmission of information on a quantum level, not a feature of space-time. The space and time parts are only relevant later.
General relativity admits traversable (i.e. macroscopic) wormholes. This is what we're discussing.
> you need an equation to explain that
Which equation? Schroedinger? The SE has time as a variable and doesn't do any of the "time travel" stuff you're talking about, so you must be referring to something else.
Quantum particles decay and change and do stuff to each other and to understand it you need an equation to explain that, but some of those equations require the state of those decayed particles to provide their state to earlier parts of the equation, before they were created through quantum decay or their state determined by waveform collapse. This is sometimes described as time travel but it's not really, time has no relevance at that level of understanding. WE live in space-time and quantum physics is the foundation of that fabric. So the solution doesn't really violate the laws of time, it happens in a place where space and time don't have the same relevance.
If you somehow did create a feedback loop in this situation we'd never know. The concepts of it taking forever or being instantaneously resolved don't apply, because as far as we're concerned we only get the end product. We're not even sure of coherence is a good way of telling how much work has been done in a twisty, strange quantum problem like that.
I mention coherence because at the quantum level it's the only way of knowing which direction everything is happening in. It's not the same as time, but it's a bit more like very very fast entropy at a quantum level.
All of these things come together to give you space-time.
So when we talk about wormholes we're talking about the transmission of information on a quantum level, not a feature of space-time. The space and time parts are only relevant later.