I like the idea that time machines can only transport people within the time machines own timeline. You can go back in time and see yourself finish the time machine but you can’t go back one second before that.
Like it’s one end of wormhole that gets anchored at a particular point in time and the other end drifts forward through time, you can enter and exit the wormhole at any point in its worldline but only within that limit
It’s still allows for time travel, and explains why no one has ever met a time traveller.
I mean, backwards time travel goes against our current understanding of physics. But multiple dimensions, or the many-worlds interpretation, etc, are not incompatible with our current understanding of physics, no, it’s just presently an untestable hypothesis
It doesn’t work with the law of conservation of energy for one. Except if you assume a framework of universes, in which anything goes but then you needn’t bother with physics at all.
You know what’s funny? Conservation of energy isn’t true on a universal scale in our universe in the first place. The expansion of our universe over time actually breaks that symmetry. This is why light can get redshifted over travelling long distances. It loses energy into… nothing
It doesn’t work with the law of conservation of energy for one. Except if you assume a framework of universes in which anything goes but then you needn’t bother with phisycs at all.
MWI can easily ignore conservation of energy either by only considering in-universe energy or otherwise putting all universes in the same configuration space (much like one of those matter phase graphs showing how possible states grow on one side)
This does still leave plenty of problems around stuff like branching triggers and much more, though
I like the idea that time machines can only transport people within the time machines own timeline. You can go back in time and see yourself finish the time machine but you can’t go back one second before that.
Like it’s one end of wormhole that gets anchored at a particular point in time and the other end drifts forward through time, you can enter and exit the wormhole at any point in its worldline but only within that limit
It’s still allows for time travel, and explains why no one has ever met a time traveller.
https://en.wikipedia.org/wiki/Primer_(film)
The concept of timelines (or that each decision creates a new dimension) ignores almost all of the fundamental laws of physics.
I mean, backwards time travel goes against our current understanding of physics. But multiple dimensions, or the many-worlds interpretation, etc, are not incompatible with our current understanding of physics, no, it’s just presently an untestable hypothesis
It doesn’t work with the law of conservation of energy for one. Except if you assume a framework of universes, in which anything goes but then you needn’t bother with physics at all.
You know what’s funny? Conservation of energy isn’t true on a universal scale in our universe in the first place. The expansion of our universe over time actually breaks that symmetry. This is why light can get redshifted over travelling long distances. It loses energy into… nothing
It doesn’t work with the law of conservation of energy for one. Except if you assume a framework of universes in which anything goes but then you needn’t bother with phisycs at all.
MWI can easily ignore conservation of energy either by only considering in-universe energy or otherwise putting all universes in the same configuration space (much like one of those matter phase graphs showing how possible states grow on one side)
This does still leave plenty of problems around stuff like branching triggers and much more, though
Woldlines are a part of physics. Look up light cones.