This means that if you go back in time and kill your grandfather, you don't exist, which means your grandfather can't be killed. As you can see, two realities are happening in parallel here. The grandfather paradox is also a key plot element of the famous Hollywood film Tenet (released in 2020), directed by Christopher Nolan.
While all this talk about time travel and the grandfather paradox is obviously purely hypothetical, there is evidence of two realities occurring in parallel at the same time. This is a phenomenon in the quantum world called superposition.
Contents:
Introduction: 0:00
The problem of traveling to the past: 0:49
What is the grandfather paradox: 1:10
What is overlay: 3:16
Is traveling to the past possible? :3:45
#science #animation #grandfatherparadox
Video link on quantum entanglement: https://youtu.be/fkAAbXPEAtU
The references:
https://plato.stanford.edu/entries/time-travel/#WheTimTra
http://people.bu.edu/pbokulic/papers/BHC-Hawk-PSA.pdf
https://physics.berkeley.edu/news-events/news/20201108/the-black-hole-paradox-nears-its-end
http://ffden-2.phys.uaf.edu/webproj/212_spring_2019/Noah_Snelson/index.html
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