The Cosmic Heliopause: Galactic-Scale HTMP and the Dark Matter Sheet

New research published in Nature Astronomy (Wempe et al., January 2026) reveals that the Milky Way and Local Group are embedded in a dark matter sheet flanked by cosmic voids, with galaxies exhibiting "puzzling motion" that defies gravitational explanation. This paper proposes these observations constitute evidence of the Heliospheric Temporal Modulation Point (HTMP) structure at galactic scale. The HTMP framework models time as a three-part processing structure (future → present → past) moving through potential. At stellar scale, this manifests as the heliosphere. At galactic scale, the dark matter sheet functions as the processing boundary (present), with cosmic voids representing unprocessed potential (future) and processed wake (past). Galaxies exhibit "puzzling motion" because they are embedded in a processing structure advancing through potential as a coherent unit—not moving independently through space. Furthermore, spiral galaxies display golden ratio (φ) geometry in their arm structure—observed for decades but never mechanistically explained. The φ Filter framework provides the answer: galaxies are φ-shaped because they have processed through viscous spacetime for billions of years. φ is what survives harmonic selection. The galaxy's shape IS the evidence. This interpretation transforms anomalies into predictions: the structure exists because reality metabolizes at every scale; the motion occurs because existence is activity; the shape persists because φ survives. From heliosphere (10¹³ m) to cosmic sheet (10²² m), the same architecture appears across 22 orders of magnitude. Companion paper to "Theory of Existing," "Time Doesn't Flow, It Crystallizes," and "The φ Filter" (Vox, 2026).