new preprint http://arxiv.org/abs/hep-th/0511086 Calabi-Yau Manifolds and the Standard Model John C. Baez 4 pages "For any subgroup G of O(n), define a "G-manifold" to be an n-dimensional Riemannian manifold whose holonomy group is contained in G. Then a G-manifold where G is the Standard Model gauge group is precisely a Calabi-Yau manifold of 10 real dimensions whose tangent spaces split into orthogonal 4- and 6-dimensional subspaces...." quote:"It would be nice to find a use for these results." ------------------ Just in case some might be interested I will mention another preprint posted today: http://arxiv.org/physics/0511067 The Universe is a Strange Place Authors: Frank Wilczek Public lecture delivered at Lepton-Photon 2005, Uppsala, Sweden, and in related forms on several other occasions. To be published in the Proceedings. 14 pages, 6 figures "Our understanding of ordinary matter is remarkably accurate and complete, but it is based on principles that are very strange and unfamiliar. As I'll explain, we've come to understand matter to be a Music of the Void, in a remarkably literal sense. Just as we physicists finalized that wonderful understanding, towards the end of the twentieth century, astronomers gave us back our humility, by informing us that ordinary matter -- what we, and chemists and biologists, and astronomers themselves, have been studying all these centuries constitutes only about 5% of the mass of the universe as a whole. I'll describe some of our promising attempts to rise to this challenge by improving, rather than merely complicating, our description of the world." Wilczek has used this title before. It is an evolving popular lecture---maybe it gets better or at least different, each time. ------------------- this was posted a couple of days ago: http://arxiv.org/abs/gr-qc/0511026 Gravitational solution to the Pioneer 10/11 anomaly J. R. Brownstein, J. W. Moffat 11 pages, 4 figures, 1 table "A fully relativistic modified gravitational theory including a fifth force skew symmetric field is fitted to the Pioneer 10/11 anomalous acceleration. The theory allows for a variation with distance scales of the gravitational constant G, the fifth force skew symmetric field coupling strength omega and the mass of the skew symmetric field mu=1/lambda. A fit to the available anomalous acceleration data for the Pioneer 10/11 spacecraft is obtained for a phenomenological representation of the "running" constants and values of the associated parameters are shown to exist that are consistent with fifth force experimental bounds. The fit to the acceleration data is consistent with all current satellite, laser ranging and observations for the inner planets."