it's my understanding that Yershov's Preon Theory can predict particle masses a priori and his paper also describes second and third generation particles, whereas Bilson-Thompson only the first generation. http://arxiv.org/abs/physics/0301034 http://arxiv.org/abs/hep-ph/0207132 Is it compatible or derivable from Bilson-Thompson's theory, http://arxiv.org/abs/hep-ph/0503213 which apparently can be derived from LQG spin networks. Yershov paper here http://arxiv.org/abs/physics/0207120 seems to make points of contact with Bilson-Thompson. Could Bilson-Thompson ribbon model make use of Yershov's Preon model to predict particle masses? Incidentally, John Baez or Lee Smolin will Bilson-Thompsonplan to publish papers mapping out the remainder of the SM? His paper were only for first generation. Has there been any there been any indications Bilson-Thompson might publish an article along with Yershov? What would be cool would be starting with spin networks, which give rise both to general relavitivity and the standard model, you can map out the entire standard model using preons and predict particle masses. "Yershov Properties of space can be used for explanation of some patterns of nature. For example, topology of space might be responsible for the enigmatic spectrum of masses of quarks and leptons, which so far has not been explained. Here we consider a topological structure discovered in 1882 by F.C.Klein and show that properties of this structure necessarily lead to formation of a set of secondary topological structures, number of which matches the number of known fundamental particles. Some features of these structures can be related to quantum numbers and masses of the particles"