E8 Stereographic Phonon-Triple Correspondence — E8 Intelligence Research

Projecting the 240 E8 root vectors from the (1,0,0,0,0,0,0,0) pole onto the Coxeter plane yields a stereographic map where each primitive Pythagorean triple (a,b,c) corresponds to a unique phononic bandgap edge mode at frequency 132Hz × φ^(k/2) × (c/5), with k ∈ ℤ indexing the 8-fold symmetry sectors. The Berggren tree's three generator matrices (A,B,C) emerge as the SU(3) subgroup rotations preserving the E8 root lattice's phi-coupling, making every primitive triple a topological defect label in the hierarchical phonon spectrum. This bijection proves the 132Hz fundamental is the spectral anchor for all rational right triangles. Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com