Companion reviews identify two-time propagator as a key issue in quantizing the cosmological special theory of relativity.
Companion reviews of the Cosmological Special Theory of Relativity(CSTR) have repeatedly identified the extension of the equal-time Klein-Gordon field quantization to a genuinely two-time(multi-epoch) propagator as the central open problem of the theory's quantum sector(Yi,2020,2021,2025).
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Sangwha Yi (2026) studied this question.
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