The retrocausality: principle for time traveling.

    The retrocausality: principle for time traveling. 

"Retrocausality, or backwards causation, is a concept of cause and effect in which an effect precedes its cause in time and so a later event affects an earlier one. In quantum physics, the distinction between cause and effect is not made at the most fundamental level and so time-symmetric systems can be viewed as causal or retrocausal. Philosophical considerations of time travel often address the same issues as retrocausality, as do treatments of the subject in fiction, but the two phenomena are distinct." (Wikipedia/Retrocausality)

Retrocausality means that an event can affect the past. If we think that in regular causality information travels from the past to the future because the universe expands, and the lower energy universe in the future pulls information to it. That means the energy level in the future universe is lower than now and past, but we cannot notice that difference. The absolute zero point or 0-kelvin degrees is always important. 

The absolute zero point is the static point. And all other temperatures are compared with it. So if we think that the absolute zero point is like a chair, and the universe is the room. When we decrease the energy level or that room's altitude the absolute zero point also decreases. 

Measure that kind of thing. Requires that we step out from the quantum system. And then, we must find a stable point or minimum energy level in that new system. In that model universe is only part of a bigger system. We must find a stable point to compare the differences in energy levels around it. The problem is that is, if we are in the middle of a quantum system decreasing the energy level decreases also the minimum energy level in the system. So changes in energy level are always changes because we measure differences in that system. 

And that means the hot is a relative thing. Boiling liquid nitrogen is cold for us. But it's hot in its environment, where temperature is always near zero kelvin. And if we are inside the system the energy minimum or static point will decrease when the system expands. And that is why the absolute zero point in the universe is always 0 kelvin. And because we are in a system that is not coming energy from outside and a system called the universe expands, we cannot see differences in energy levels. 

Above is M.C. Escher's impossible triangle. That thing can symbolize a system. That can transmit information from the future to the past. The problem is that the system uses quantum entanglement to transport information. And if the system creates quantum entanglement between points (A) and (B). 

The point (A) is in the past and the point (B) is in future. Then it raises the energy level of point (B) in the future so high that information travels backward in time there is the point where point (B) reaches the same energy level as point A. That thing breaks quantum entanglement. To avoid that the system must transfer the entanglement to the third point. 

Triangular model about retrocausality. 

We can think that information flows from the past to the future by following tangent (AB). Information flows from point (A) in the past to point (B) in the future. Is simple to raise the energy level of point (B) to level (C) which turns quantum entanglement to the opposite. The problem is that when the energy level in point (B) rises to a higher level than point (A) it must travel through an energy point that is the same as point (A). 

When quantum entanglement turns in a balanced position where both sides of the quantum entanglement are at the same energy level, that breaks the entanglement. That makes it impossible to create quantum entanglement that affects the future to the past. The system cannot raise the (B) point energy level straight. But its possible that system can make that thing if researchers use two quantum entanglements. In that model, the quantum entanglement is made oppositely from the past to the future. 

So the information will travel through tangent (AB) from the past to the future. And then in the future, the researchers create another entanglement (CD) where information travels from the past to the future. Another way is to make the third point (E) to the side of the point (B). Then the system must transfer the quantum entanglement to the point (E) and form a tangent (AE). Then the system raises the point (B) energy level and then it transfers the oscillation or entanglement from point (E) to point (B). The system separates that entanglement between points (A) and (B) for a while, so that it can raise (B) point energy level without breaking quantum entanglement. 

Energy and information always travel to lower energy levels. That means we can create a time machine or make quantum entanglement interact with the future. The problem with retrocausality is how to make quantum entanglement acting to the past. The past is at a higher energy level. And that means the quantum entanglement should create the point to the future, that is at a higher energy level than its other side in the past. This thing is the problem with retrocausality. 

https://en.wikipedia.org/wiki/Retrocausality