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Time in the Einstein's Block Universe

 

Time is a strange phenomenon. We talked about entropy in our, thermodynamics article. In our classical perception, the time has a relationship with entropy. We know that the direction of the arrow of time always flows forward with the positive progression of entropy. Because common sense tells us that this is so. So is it really so?

Let go of whatever work you are doing for a moment and imagine your past, present, and future. Which one do you think actually existed? Many of you have lived the past and it was real, I am living in the present moment and this was real but I did not live in the future, you may not be sure of its reality. If you are someone who accepts only the present, you are presentism. How can we agree on a time when we even doubt reality? We cannot be…

In his theories, Newton defined space and time as absolute. In fact, he was intuitively right in his own reference. However, our deeper-thinking genius, Einstein, had stated in his theory of relativity that space and time are not absolute, which we have proven over and over again in experiments. According to relativity, space and time are intertwined. Objects with mass bend and bend space, and in this environment where even light is bent, time also bends. Thus, our perception of time changes according to the fabric of the space we are in. The perception of time is not the same for us on earth and astronauts orbiting the Earth. Time flies fast for astronauts, who are little affected by gravity. In this case, time cannot be absolute.

After a short introduction, let's get back to our main topic. We learned that time is not absolute. But does an event we have experienced in the past or an event that we will experience in the future still exist physically, or does it exist when we experience the present by moving forward? According to Einstein's block universe model, they all exist at the same time. Only when we surrender ourselves to entropy do we perceive our life as now? Let's explain this with an example. You are living the present reality as you read this article. But this article was in a file in the internet database even if you didn't read it, and it will continue to stay after you read it. We call the time in the block universe, which we explain based on relativity, the B Theory of Time. Theory A of time, on the other hand, is that time is absolute and the present is real, as put forward by the aforementioned Newton.

The “things” we live were, are, and will exist. We can liken them to slices of bread lined up side by side. In short, according to block time, time is like slices of bread, when we go into the flow, we taste each slice and all of them are real.




Reference

https://timeincosmology.com/2014/12/21/is-time-really-passing/

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