What question did this study set out to answer?

The aim is to formalize the selection rules that determine allowed transitions in neutron junction-slip processes.

January 22, 2026Open Access

Companion D: Topology and Selection Rules for Junction-Slip (Neutron → Proton)

Key Points

The aim is to formalize the selection rules that determine allowed transitions in neutron junction-slip processes.
Documented winding/sign conventions related to junction-slip.
Defined admissible junction moves based on topological constraints.
Established charge and spin bookkeeping across brane and bulk sectors.
Clarified which transitions between neutrons and protons are permitted.
Outlined how these transitions adhere to topological principles.
Served as a canonical reference for further analysis in related papers.

Abstract

This companion formalizes the topological selection rules and symmetry-layering assumptions behind the neutron junction-slip transition in NJSR. It documents how winding/sign conventions, admissible junction moves, and topology constraints define which transitions are allowed and how charge/spin bookkeeping is enforced across brane and bulk sectors. It is the canonical technical reference for the “what transitions are allowed” part of Paper 3.

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