It could have. If you cant explain how time works than you cant logically say that matter couldnt have always existed. We know its always been around. If there was no space time continium, how are we alive. Things wouldnt have time to evolve or yet alone let the big bang occur. matter has always existed -> "Matter cant be created nor destroyed". Logically prove me wrong, that is if you can.

Shinto: matter is matter, negative matter is matter only negatively charged so to speak.

Arbitus: a time machine could, granted that we fiigure out how to bend/rip/manipulate the S.T.C, other than that in my previous statement. We will eventually figure it out with time.