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This research presents a new model to explain the Galactic Center Gamma-Ray Excess without introducing new particles or parameters.

June 12, 2026Open Access

Paper CXLI: The Galactic Center Gamma-Ray Excess as Diffuse Brane Excursions at G2 Tiling Interstices — A Parameter-Free Explanation of the Morphological Anisotropy

Key Points

This research presents a new model to explain the Galactic Center Gamma-Ray Excess without introducing new particles or parameters.
Proposed a new interpretation within the One-Octonion Brane-Bulk Framework for the gamma-ray excess.
Used existing boundary conditions to derive predictions about the morphological anisotropy of the gamma-ray emission.
Identified the alignment of the observed asymmetry axis with specific Galactic coordinates.
Predicted alignment of the GCE's morphological asymmetry axis with Galactic coordinates l≈151°, b≈+56°.
Identified the north-south asymmetry of the GCE as a result of brane tilt toward the predicted axis.
Provided a new physical explanation for the GCE that requires no additional particles.

Abstract

The Galactic Center Gamma-Ray Excess (GCE) detected by the Fermi Large Area Telescope has resisted explanation for fifteen years. Current competing hypotheses — WIMP dark matter annihilation and unresolved millisecond pulsars — predict morphologies that are now observationally indistinguishable (Muru et al. 2025, PRL 135, 161005). Both require new physics or unobserved stellar populations. We propose a third interpretation within the One-Octonion Brane-Bulk Framework: the GCE is diffuse radiation from transient bulk field excursions into the brane at G2 tiling interstices. This mechanism requires zero new particles and zero free parameters — all geometry is fixed by the same G2=Aut(I) boundary condition that already derives the Ursa Major sump (Papers CXXXIX–CXL). The framework makes a specific, falsifiable prediction: the GCE morphological asymmetry axis should align with the direction l≈151°, b≈+56° (Galactic coordinates of the sump). The observed north-south asymmetry of the GCE (Muru et al. 2025: 'strongly favored by the fit, physical origin unclear') is identified as the brane tilt toward this axis. The framework provides the missing physical explanation. Part of the One-Octonion Brane-Bulk Framework series. Anchor DOI: 10.5281/zenodo.19120873. Community: one-octonion-brane-bulk. Author: Bharathi Dasan Jagadeesan, M.D., University of Minnesota. ORCID: 0000-0002-1143-941X.

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