Comment It is posible? (Score 1) 534
According to the article general relativity allows time travel. But it doesn't says that time travel is ok with quantum dynamics.
I'm not a physicist, but I think time travel of things larger than a sub-atomic particle is not possible.
The laws of quantum mechanics provide information of the state that a system will have in the future given the state of the system in the present. But they also can be used to calculate the state of the system in the past. So, if I'm alive now, the laws of quantum mechanics say that my parents were alive when I was conceived. So the laws wouldn't permit that I traveled to the past and killed one of them.
In fact, they wouldn't permit that I change nothing of the past, because breathing there wold cause a perturbation that wouldn't be allowed by quantum mechanics.
I'm not a physicist, but I think time travel of things larger than a sub-atomic particle is not possible.
The laws of quantum mechanics provide information of the state that a system will have in the future given the state of the system in the present. But they also can be used to calculate the state of the system in the past. So, if I'm alive now, the laws of quantum mechanics say that my parents were alive when I was conceived. So the laws wouldn't permit that I traveled to the past and killed one of them.
In fact, they wouldn't permit that I change nothing of the past, because breathing there wold cause a perturbation that wouldn't be allowed by quantum mechanics.
