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(I don't advise it to you, however).
Quote(I don't advise it to you, however).You had me at "very strange," but this resolved any doubt. Please continue!
the positive mass attracts the negative but the negative repels the positive
Quotethe positive mass attracts the negative but the negative repels the positiveA bit like me & women. Women attract me... 
There is no proposed 'particle' with negative mass in quantum field theory. I understand what you are proposing (it is basically the Hermann Bondi/Robert Forward proposal) but I remain to be convinced that it has any practical application.In GR negative mass can also be assumed to be a spatial solution to GR where the stress component of the stress-energy tensor is larger than the mass density - that makes more sense to me....
I think the papers' discussions about the behavior of negative mass make for fascinating thought experiments. For example, I'd love to see where a bit of negative mass would go, if it we could follow its journey around the universe. I suppose it would have to end up, eventually, wherever gravity is weakest. Care to speculate about where that might be?
Hmm...I see where you are going but I'm not convinced. OK, we can regard dark energy as -ve energy and we can even posit that it cancels out the positive energy (in the form of energy and mass) in the universe to give a universe of 0 total energy. That appears to me to be very interesting (especially since it would appear to allow the entire universe to be a 'quantum fluctuation' of infinite pay-back time and, thus, give us a mechanism for 'something from nothing'). The pages you cited, however, seem to conclude that the entire energy sum of the observable universe is negative....that seems somehow wrong to me. I'll have to read it in more detail before I can properly critique it....
I really don't know how much scientific exactness we can ascribe to these concepts, but I have to admit that the reasonings they have made don't seem blatantly wrong...
Very interesting, I didn't know it.