There may or may not be negative energy (and there's definitely dark matter); my only thing is that the mechanics of such things are much more lenient than hard scientific fact, when dealing with the metaphysical (especially in fiction).
“…Judge not what a man has done, but judge what he could have done if he was a different bloke altogether. For art thou a leper? And a leper can changeth his spots…” --Rudy Wade, Misfits (Series 4, Episode 8)