Originally posted by black beetle
Yes, we drop a bottle and it breaks –time irreversible, however all the laws of physics show that there does not seem to be any distinction between the past and the future. Feynman amongst else stated perfectly well what we get when we have a sun and a planet, and start the planet off in some direction, going around the sun, and then we take a moving pi ...[text shortened]... e is reversible are the law of electricity and magnetism and the laws of nuclear interaction
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Who says time exists to be 'reversed'?
Velocity is a physical property, the object is going in a certain physical direction.
Mathematically you can 'just' reverse the direction and run time backwards but
I would like to see you do it in reality.
The map is not the territory.
If you do a simple trajectory calculation for a cannon ball fired from a cannon
sitting on an infinite flat plane the equation gives 2 solutions for the points
where the cannon ball hits the plane.
One is in front of the cannon where you expect it, the other is behind the cannon.
This is because the path of the cannon ball is a parabola and the mathematical
parabola will pass through the plane twice.
However only one of those solutions is actually physical.
I don't really care if you can show mathematically that you can just reverse time in an
equation. If you can't actually do it in reality then it's not physical.
There are plenty of current models of physics that do not have time in them.
The universe just has it's present ever changing state...
A good analogy would be evolution.
Evolution has no 'direction'. You just have the current species constantly adapting to
their environment. We can look at the changes and see a change in environment undo
the changes made by the last environment. for example there is a species of moth in
London which has a white and a dark variant, the dark variant became much more common
due to pollution and soot making the surfaces it sat on darker and thus making the white ones
easy to spot by predators. New pollution controls have reduced the pollution, cleaned
the habitat, and now white ones are becoming more common again. We see this as a reversal
but neither time nor evolution is running backwards.
If you want to tell me you can just run time backwards you have to demonstrate that it exists
in the first place and then that it can be reversed. And being able to run the maths backwards
doesn't do that.
Until then you need to make arguments that don't rely on this unproven premise.