The relativity theory united the two, looks like different entities, the space and the time into one integrity, space-time. This thought ...
The relativity theory united the two, looks like different entities, the space and the time into one integrity, space-time. This thought is an argument about this unity, the equivalence of the space and time.
The relativity theory showed us that space and the time quantities are subject to how we are moving. The time became a real dimension like quantity, not just a hypothetical one, the time becomes the fourth dimension. Slightly different from the space itself, but in the Minkowski's space-time interpretation, they can be united and can see all as dimensions.
If I am moving differently than you are, then I see the space and the time differently than you do and need the formula to connect my space and time with yours. This subjective view of space and time is the consequence of the two recognized postulates, the laws of nature are the same for anything, independently how it moves, and the speed of the light is the same for anything, independently how it moves. These recognized postulates (which are actually one because the speed of the light is a law of nature, but because it is ultimate, unreachable by any matter, good to think about it separately) are the foundation of the relativity theory.
The space-time becomes the founding entity of our world. This is the direct consequence of the postulates, which are true and not just postulated, but since then it is proven true. But space and time are really changing if I am moving differently? And are they objectively or just subjectively different in the sense of only I see it differently, or really, space and time become different according to how I move?
Of course, the distance of two stars won't be changed if I am moving between them at different speeds, they are not moving closer or farther, space won't change between them, it differs however on how I measure the distance between them when I moving differently. The change of the space in the case of different moving states is a subjective reality to me. Or we may say, space is a global parameter, not dependent on how I move, only when I measure it differs according to how I move. Space is an independent quantity from me, and this way can be a dimension. When we move, space and distances are like a perspective, like a length when we see it from different angles. Two stars are not pulled closer when I traveling between them faster and faster, not even if I am not moving at uniform speed but change my speed constantly.
Can the time be seen similarly as space, as an objectively existing quantity, as a dimension similar to space, and only our perspective differs when we are moving differently? In the relativity theory, it is a dimension like entity similar to space. But physically really is a dimension or only a kind of entity that can be described as a dimension?
Is the time dilation is a subjective reality, like as I won't pull the two stars closer if I go faster between them, or objective reality, a remaining difference in quantity in different moving states?
The time is different from the space when we discuss its dilation, the two quantities are significantly different, and pointing toward what time physically is.
We may think about it the way, it is a similarly subjective reality because in the situation, if you move relative to me, I see your watch counts the time slower than mine. But you can think in the way, and you can say, I am still, and you are moving relative to me, and you see my watch counts the time slower than yours, instead of when we moved together, our watches counted the time in the same manner. So this way the time dilation looks subjective reality, we symmetrically measure the time differently, but both watches cannot go slower and faster in the same instance.
However, there is a situation when the time dilation is a remaining, and objective quantity. If we use two watches, which count the time at the same rate, and move one of them to a different place, and move it back to the same place where the other watch stays still, the watch remained in its place shows more spent time than the other. This difference is an objective reality; one watch existed less than the other did. Or in a more viable example, if we start to travel in the same instance, and I travel the same distance in different speeds than you do, but our average speed is the same, we arrive in the same instance but our starting place synchronized watches show different time at the finish. This is our objective but a different reality. In this way, the time cannot be a dimension, an independent reality from me. I have my time, which belongs to me, and only to me. The time is not an independent reality, it exists only for me, as your time exists only for you. The time exists subjectively for everything; it exists only if I am present.
Space is an independent reality from me, even if I can measure subjectively, but the time is a subjective reality, exists only for me, even if our watches are counting the time at the same rate.
Now we can go back and think about what is the cause and what is the effect is in the relativity theory. The theory declares the speed of the light is the same for anybody independently of how it moves. Is this postulate a cause or an effect on our physical world? Because it is a postulate, we can think it is a cause and everything that the relativity theory states are an effect of this cause. But based on the physical reality, the constant speed of the light is the effect of the subjective view of the time. My time goes differently if I travel at a different speed and this is why I see the speed of the light as the same, independent how I move. And this is why the physical laws of nature are the same for anything, independently from how it moves.
However, a question arises with this statement. How is it possible that the speed of the light exactly the same in any state of movement? Why should be this constant a derived consequence of the changing time? It must be a reason for that in nature. This is similar to the Pythagoras theorem. The mathematical connection between the sides of the perpendicular triangle is not a postulate but a provable consequence, a consequence that can be pointing out. Similarly, what is the real physical cause, which causes the constant speed of the light? What is the physical cause of the time to change for me? And why the way, it causes the constant speed of the light? Still needs to answer. The answer may lie where we will find what physical reality is the time, what our subjective reality is which means the time for us.
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