The "Strand Model" of fundamental interactions [Mentor's note: This thread is a consolidation of three different threads which were started in our Beyond the Standard Model forum. They were moved to our former Independent Research forum, because in our view this represents a "new" or "personal" theory that has not yet reached mainstream physics discussion. At that time (2009) we allowed discussion of such theories only in the Independent Research forum. Since then we have closed the Independent Research forum and all discussions in it, as per this thread: https://www.physicsforums.com/showthread.php?t=506643 and moved all posts from that forum into the General Physics forum. Note also our current rules, which can be found by clicking the Site Info --> Rules & Guidelines link at the top of any page here, in particular the section Discussion Guidelines. Please do not re-open discussion of this theory on Physics Forums until it has been published in a peer-reviewed journal.] [Original post by heinz:] The preprint http://arxiv.org/abs/0905.3905 by Schiller intrigues me. He proposes to deduce the electromagnetic, weak, and strong force from Planck units directly. So far, all microscopic models of nature I have ever read have a problem: there is no explanation of what interactions are. This case is different: interactions are defined as transfers of string crossings. From this idea, Schiller deduces an argument for why there are only three forces, and for why they have the usual gauge groups. It is the first time I ever read such an argument. That is why it intrigues me. On the other hand, the whole thing is really speculative. "There is no doubt your theory is crazy - the issue is: is it crazy enough?"