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8 minutes ago, write4u said:

I agree, but time is not a causal function. It is a result of a chronological duration (unfolding) of something physical. Moreover, time is a variable, not a constant.

Time itself is immeasurable.  Time associated with specific objects or sets has names:

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Note: time does not exist ahead of the present. The future is a timeless, dimensionless, permittive condition.

Time is an emergent result of duration of something. There is no time in the future. The future does not yet exist. 

That’s like saying the past doesn’t exist. As I explained; at the quantum level, the past might be replaced. Is the interpretation retrocausality or is it nonlocality? They both have the same outcome we have observed. However, the future is just the result of the next iteration in a mathematical set of fundamental exchanges of information. Just because we perceive the world like this, holding memories of how we were within a moment  that morphed into this moment, does not make it any more valid than if we didn’t know the past but had memories of the future. 

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13 hours ago, JeffreysTubes8 said:

That’s like saying the past doesn’t exist. As I explained; at the quantum level, the past might be replaced. Is the interpretation retrocausality or is it nonlocality? They both have the same outcome we have observed. However, the future is just the result of the next iteration in a mathematical set of fundamental exchanges of information. Just because we perceive the world like this, holding memories of how we were within a moment  that morphed into this moment, does not make it any more valid than if we didn’t know the past but had memories of the future. 

Recycling is not going back into the past. The arrow of time can only be directed into the future.  Even if time-travel into the past were possible the traveler's own time would be going forward as he traveled backward, which creates an impossible paradox.

The point is that you cannot undo what has been done before.  It is physically impossible for objects to reverse the duration of their existence even as they can reverse their physical interactive chronology, which also requires a steady state medium.

The dynamic nature of spacetime prohibits chronological reversal of change from quantum to galaxies. How do you undo a supernova?

Even the Bohm laminar reversal experiment does not reverse time, even as it reverses physical properties to their original state. But it takes time ahead to go back.

 

 

Perhaps we can theoretically fashion such a model, but I am willing to bet that time-travel is impossible. At best we might be able to use entanglement as some scientific daredevils proposed, but IMHO you never undo what has gone before.

Edited by write4u
correction
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Actually, while we can’t change the structure of an object without infinite incalculable and Star consuming amounts of voltage, change a macroscopic object with the quantum eraser, nor can we actually travel back in time, it may be possible to calculate backwards (for a finite duration) instead of forward and it may be possible to send signals across light years instantly, and even send signals to the recent past, it is not possible to change your place in time.

However, with nanotech it is possible to rewire the brain to perceive time memorize in reverse back the present until birth.

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