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PessimisticChap10 karma

My brother posed me an interesting thought experiment:

Suppose there are two identical (down to the every last particle) rooms containing a cat, Room A and Room B. We accelerate Room A very close to the speed of light, such that time slows down in that particular room. We do this for a duration until the perceived time difference between both rooms is five years.

My brother thinks that the cat in Room B that has aged five years (in the room that didn’t accelerate) relative to the cat in the Room A, is basically the exact same cat but 5 years older, and is basically the future version of the cat in Room A. Everything the cat in Room B has experienced in five years, cat A will experience.

What do quantum physicists think of this? (Thanks in advance, just thought it was incredibly apt for me to ask this in this particular AMA)