How people’s views on the nature of time have changed for a long time. Until the early 20th century, people believed in absolute time. That is, each event can be called “ Time ” All good clocks are consistent in measuring the time interval between two events. However, the discovery that the speed of light is always the same for any moving observer led to relativity; In the theory of relativity, people must abandon the idea that there is only one absolute time and replace it with his own time measurement recorded by the clock carried by each observer &mdash— The readings of clocks carried by different observers need not be the same. In this way, time becomes a more subjective concept for the observer making the measurement.
When people try to unify gravity and quantum mechanics, they must introduce “ Virtual ” The concept of time. Virtual time cannot be distinguished from spatial direction. If a man can go north, he can turn his head and go south; Similarly, if a person can move forward in virtual time, he should be able to turn around and walk back. This shows that in virtual time, there can be no important difference between forward and backward. On the other hand, when people examine “ Real ” Time, as we all know, there is a great difference between forward and backward. Where does the difference between the past and the future come from? Why do we remember the past instead of the future?
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