Last week my wife and I saw a Japanese cartoon movie called "Stand by Me Doraemon". After the movie, I said:"In the Doraemon's world, there is no concept relating to parallel universe." My wife then asked me what parallel universe was. I said it was a guess in order to solve the paradox induced by Time machine. Bear with me, I am going to explain here.
As a human being living in 3 dimensional world, time is our ultimate limitation which we always dream to overcome. People dream to have a time machine to travel to the past and hopefully stop any mistakes we were going to make. But then someone doubt forcefully :"If you travel to the past and kill your parents. Do you still exist in your world? If exists, how come you are born but your parents have been already murdered?If not, how come you are here and travel to the past?"This breaks the causality at both sides! This paradox is equivalent to claim that time machine is pathetically impossible. As people are so eager for time machine, they invent a guess to let the causality still hold and therefore "Parallel universe" introduced.
Parallel universe claims that there are many universes coexist with the one we are living in. The hypothesis claims that if your travel to the past with time machine, you are actually going to another different universe. What you have done on that universe will induce no effect on the original one. They are perfectly independent. If you kill your "parents" at that universe you traveled, that universe will continue to run without your parents and eventually without you. At the same time, the original universe will go smoothly with your parents and you as the son/daughter now travelling to the past. Causality will not break and problem solved, isn't it?
What's your opinion? I know you may ask:"If there are many universes coexist, how to find such enormous space to hold so many universes?" Let talk about this next time.
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