This document pre-registers a complete, falsifiable search programme for adjacent causal domains — neighbouring "universe" regions of the timeon lattice framework (Davey 2026a–d) — hypothesised to be observable as objects currently catalogued as galaxies. All claims are conditional on the framework; the document enumerates conventional explanations first and specifies, in advance, the measurements that would exclude each. The framework separates the intrinsic source, the domain interface, and the detector. Core results include: existence and stability conditions for a static inter-domain wall from a covariant effective action with explicit closure functions; a sign-topology theorem showing smooth one-to-one transfer cannot create additional velocity-sign domains; a non-identifiability theorem showing a single extraordinary object cannot establish adjacency, motivating interface tomography across sky patches; a parallel compact-object exclusion channel for gravitational-wave catalogues; distance-duality and surface-brightness diagnostics with their internal consistency identity; a fast-radio-burst dispersion channel with an achromatic ghost-pulse discriminant; an open-set hypothesis hierarchy with injection-calibrated promotion gates and a pre-registered evidence ladder (A0–A7); anytime-valid streaming surveillance via conformal test martingales; a complete data-engineering and provenance architecture; and a governed AI/agent layer under an explicit non-evidence rule. Thresholds, gates, and promotion rules in this document are frozen as of the deposit date. Subsequent changes will appear only in new versions of this record, with rationale; analyses predating a change are never re-scored under new rules. This record is the timestamp against which any future candidate or null result is judged.
George Davey (Fri,) studied this question.