In Charge of Heaven

In the depths of the endless void of the Infinite Universe, there is a mysterious and vast super time dimension field.

Time dimension: There are many different levels of time dimension in the universe. Zero-dimensional time is a time point (also called a moment), and many time points are connected into a timeline, which is one-dimensional time. The interval between each adjacent moment is one Planck time (one Planck time is equal to ten minus forty-third square seconds), and the universe at different moments is like a frame after frame of photos according to a certain The sequence of changes of the changes are arranged together and connected into a complete timeline.

The same events are happening in countless timelines in the same universe, and the same story is stitched together, but the progress of the story is different. In a certain timeline, a planet with human life has not yet been born, and humans who have mastered modern technology will not appear in this timeline until billions of years later; in another timeline, human beings are already Billions of years after mastering modern technology. The two timelines with the closest time progress are called "adjacent timelines", and the time difference between them is only one Planck time, that is, the difference between one moment later or one moment faster (although the time in the same timeline is relative, but the time difference between different timelines is absolute).

In the same timeline, although the speed of time passing in different regions of the universe is different, if you understand its essence, you will find that this is just an illusion, just a different manifestation of "absolute time" in different regions That's all. To use an inappropriate analogy, different timelines are like different vertical lines in a plane coordinate system, moving horizontally in the same direction at the same speed. There is an absolute gap between them, that is, the distance between different abscissas where they are located, and this distance is exactly the absolute time difference. But in the same vertical line, there are many different points moving vertically at different speeds, which is the relative time in human eyes. But no matter how big the difference in moving speed between those small points is, the distance between them and other timelines is the same, because no matter how you change the ordinate, the difference between the abscissa remains unchanged, and the speed of their lateral movement will not change).

In the same timeline of the universe, due to the different "density" of time in different regions, it is only a few minutes in other places after a few years in some places. Assuming that there are "first zone" and "second zone" in the universe, the speed of the former is the same as that of the earth, and the time flow rate of the latter is equivalent to one-tenth of the former (after ten seconds in the first zone, the second The second district only experienced a second). For creatures in the first zone, the shortest meaningful time (Planck time) in the universe is ten minus forty-third square seconds; for creatures in the second zone, Planck time The time should be ten to the minus forty-fourth power second (because one second in the second zone is equal to ten seconds in the first zone).

If a traveler goes back a hundred years ago, he will go to a timeline that is a hundred years slower than his original timeline, and will not change the history of the original timeline (the traverser will not Must be living things, some civilizations transport matter across timelines can also be referred to as "travelers"). In order to prevent the timeline itself from collapsing, there is a law of physics in the universe: the sum of the masses of travelers that can be accommodated in a timeline at the same time cannot exceed the "time travel constant" (there is a special value used to measure the time-space hole itself. scale, but this "scale" neither represents the volume nor the number. The size of the "time travel constant" depends on the maximum value of the space-time hole that the universe can accommodate. In different universes, this constant may not be exactly the same ), and the total energy cannot exceed the square of the unknown speed of light "time travel constant".

In the process of time travel, the higher the accuracy of the time machine, the closer the timeline that the traveler goes to is closer to the target timeline of the traveler. For example, if a traveler wants to travel to the future forty-eight hours later,

A time machine with low precision may bring him to a moment that is one or two minutes or one or two seconds later than the future after forty-eight hours (as long as there is a time error, it means that the timeline that the traveler came to is not his goal timeline.

If the error is one second, then the deviation between the timeline of the traverser and the target timeline is ten to the forty-third power. If the error is one Planck time, the deviation value is one, which means that the timeline where the traverser comes and the target timeline are adjacent timelines. If the deviation value is two, then there is a timeline between the timeline where the traverser came and the target timeline).

And the top civilization in the universe can create a time machine with zero error, allowing the traverser to arrive at the target timeline accurately, without even a Planck time error (under normal circumstances, the time machine created by a lower civilization The deviation value in the operation process is generally greater than ten to the forty-third power; the operation deviation value of the time machine created by the middle civilization is about ten to the eighteenth power to ten to the twenty-three power; the time machine of the advanced civilization Basically, the operating deviation value will not exceed single digits. For those qualified time machines, the deviation value has nothing to do with the time span traversed, but only with its own accuracy).

If the traverser goes to a certain timeline and deviates that timeline from the original trajectory (that is, makes this timeline happen something that has not happened in other timelines), then this timeline will split into two Strips: One of them will leave its original time plane (the sum of countless time lines is the two-dimensional time-time plane), and the other one will continue to run according to the original track, filling the vacant part left on the time plane. Because the same events occur in all timelines under the normal law, so at a certain moment in other timelines, there will be an identical traveler traveling through time and space, changing the trajectory of the timeline, but the sequence is different That's all. So as long as there is a traveler who travels through time and space, countless timelines will split, and countless timelines that are separated from their original timeplanes will form a brand new timeplane. In two different time planes, different stories and different histories are staged; and in the same time plane, the only difference between different time lines is the difference in progress.