| Antonio;
If the time machine maintained spatial consistence I think the dynamics of physical reality would cause the Earth, the solar system, the galaxy, and maybe even the universe to leave him behind such that when he stopped his time travel, he would find himself in the empty space or in the void of the cosmos.
I am somewhat confused as to your use of the term "symmetry". What symmetry are you referring to for these particles exchanging roles?
__________________ David  |