2013/01/21 by Eric Lewin Altschuler, A. Pérez‐Garrido, Altschuler, Eric Lewin +2
Engineering · Mathematics · Physics and Astronomy · #Advanced Materials and Mechanics #Mathematical Approximation and Integration #Stochastic processes and statistical mechanics #math.MG #physics.comp-ph
paper · pdf · doi:10.48550/arxiv.1301.4884
arxiv created 2013/01/21 · arxiv updated 2013/01/22
How many unit n-dimensional spheres can simultaneously touch or kiss a central n-dimensional unit sphere? Beyond mathematics this question has implications for fields such as cryptography and the structure of biologic and chemical macromolecules. The kissing number is only known for dimensions 1-4, 8 and 24 (2, 6, 12, 24, 240, 19650, respectively) and only particularly obvious for dimensions one and two. Indeed, in four dimensions it is not even known if Platonic polytope unique to that dimension known as the 24-cell is the unique kissing configuration. We have not been able to prove that the 24-cell is unique, but, using a physical approach utilizing the hopf map from four to three dimensions, we for the first time delimit the possible other configurations which could be kissing in four dimensions.