Theoretical analysis demonstrates preservation of flat Robertson-Walker line elements under modified Lorentz boosts, indicating valid relativistic frames across cosmological time scales.
The Cosmological Special Theory of Relativity(CSTR) postulate a modified Lorentz transformation, parametrized by a boost velocity v_0 and the Robertson-Walker scale factor a(t_0) evaluated at the cosmological time of the observer, and shows that it preserves the flat Robertson-Walker line element at fixed cosmological time.
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Sangwha Yi (2026) studied this question.
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