A Systematic Analysis of Immortality Pathways Under the "Root-Worldline" Framework

Building upon the "Root-Worldline" theoretical framework developed in prior work(Pang, 2026a, 2026b, 2026c), This paper systematically redefines "immortality" andexplores its only viable pathway. We first argue that traditional "content-copyingimmortality" is metaphysically impossible under the premise that the "Root"—theirreducible phenomenological fact of first-person perspective ownership—is anchoredIn the "Worldline Realization," a unique, continuous physical-historical process.However, this does not render immortality impossible; rather, it delineates the solesolution space: the continuous continuation of the Worldline Realization itself.We propose three distinct immortality pathways: (1) Symbolic Immortality: theinheritance of "Worldline Content" as cultural memes, shaping supra-individualhistorical processes; (2) Ontological Immortality: the gradual migration of the substrate,allowing the Worldline Realization to which the "Root" is anchored to transitionsmoothly to a new physical substrate; and (3) Cosmological Immortality:reconceptualizing the individual "Root" as a local perspective within the universe'sgrand, continuous Worldline Realization.The second pathway constitutes the paper's core contribution. We propose a three-phase substrate migration framework that can be initiated with the current (2026)technology: Phase I establishes real-time tracking and external mirroring of the "RootSignature"; Phase II achieves bidirectional causal coupling, allowing the Root Signatureto "float" across a bio-electronic hybrid substrate; Phase III aims for the completemigration of the Worldline Realization through neuron-by-neuron replacement. TheThe central validation criterion for the entire process is the topological continuity of theRoot Signature—as long as the Root Signature maintains continuous evolution inpersistent homology space, it demonstrates that the same "Root" has completed thesubstrate migration.This paper ultimately concludes that immortality is not "copying content," but"continuing history." This is not merely a technological vision, but a fundamentalresponse to the question "Who am I?"Methodological Statement: The "gradual substrate migration" proposed here is atheoretical framework and technological vision. All work related to Root Signatureextraction, tracking, and perturbation simulation can be validated using computationalmodeling and publicly available datasets, without involving any human experimentsbeyond existing ethical guidelines.