A Universe Within a Timeless Exterior: Voyager, Cosmic Plasma Boundaries, Emergent Time and a Conditional Black-Hole Interpretation

Speculative concept paper / preprint — not independently peer reviewed. Could an evolving universe possess a physical boundary within a broader reality without time? This paper develops that conjecture through a limited heliosphere analogy and restricted mathematical comparisons. The author proposes that interior driving stress, parent-induced confinement and gravitational loading maintain a plasma interface throughout expansion, with permanent direct inaccessibility postulated. The observable universe’s extent is not identified with that physical boundary. A direct Newtonian comparison of the three components gives restoring radial modes for some pressure laws and an unstable mode for another; equilibrium alone does not establish stability. A separate constant-Λ reference calculation places future light reach at about 16.7 billion light-years on today’s distance scale. Selected static signature-change sectors, a finite relational clock and an ordinary-GR moving dust boundary are also reproduced. A naive join between the dust and modified metric fails a geometric matching check. Conditional timing and plasma-transfer laws apply only where causal access is specified. These reference constructions do not form one expanding, matter-coupled cosmological solution. The timeless parent’s traction law and the full plasma boundary’s dynamics remain open. Black-hole observations inform comparisons with plasma emission and gravitational light trapping; they do not establish a cosmic wall. The contribution is a speculative framework with reproducible restricted results and explicit limits, rather than evidence for an observed exterior. Version 0.4, November 5, 2026. Illustrated concept paper, 36 pages, 19 numbered figures and 32 references. Files in this deposit:• A_Universe_Within_a_Timeless_Exterior_v0_4.pdf — the paper, including embedded animation and calculation-package attachments.• Cosmic_Bubble_Expansion.mp4 — a 40-second conceptual animation with an original soundtrack. Its layers, external viewpoint and other universes are illustrative, not observational results.• Cosmic_Boundary_Calculations_v0_4.zip — Python source, numerical tables, figures, derivations, software versions and file hashes. Twenty-one internal implementation checks include deliberate detection of an unsuccessful matching construction; they do not validate the full cosmology. Human–AI collaboration and responsibility. ChatGPT (OpenAI), under the author’s direction, assisted with research, critical analysis, derivations, calculation code, drafting, diagrams and presentation. The manuscript contains the author’s collaboration acknowledgment. Naveed Islam Butt retains responsibility for the claims, conclusions and publication decision.