http://arxiv.org/abs/gr-qc/0508104 Towards a fully consistent relativistic quantum mechanics and a change of perspective on quantum gravity 17 pages, submitted to CQG "This paper can be seen as an exercise in how to adapt quantum mechanics from a strict relativistic perspective while being respectful and critical towards the experimental achievements of the contemporary theory. The result is a fully observer independent relativistic quantum mechanics for N particle systems without tachyonic solutions. A remaining worry for the moment is Bell's theorem." ================== the PF poster Careful disagrees with me about this paper. I see this paper as proposing radical change in QM in order to make it compatible with Gen Rel. However I mentioned this paper in a couple of other threads and Careful replied that to him it does not seem very radical or unusual. For my part, I observe that a big problem in physics is that QM is so far only "relativistic" in the sense of SPECIAL relativity. And that means that QM is not really relativistic at all! there seems to be some fundamental difficulty making QM compatible with real relativity, namely with Gen Rel. And this noldus paper discusses these troubles and proposes to change QM! Or so it seems to me. the proposed change in QM would make it give the wrong answers to Bell experiment, but only by a very slight amount. So maybe Noldus QM could be right, or maybe wrong, and we simply have not noticed because of not doing the experiments with enough precision. I don't understand this and would appreciate some clarification, if anyone can offer some. So I think the Noldus paper is a radical and risky venture---one should think twice before proposing to reform QM, especially if it seems to contradict Bell theorem. CAREFUL on the other hand, seems to understand this paper much better than i do and he seems to say that it is NOT so radical at all, and earlier papers by other people have explored these ideas. I don't know these earlier papers, but this is what he says.