Examines a quadratic velocity-dependent dark sector model's viability and consistency with current observations, suggesting implications for cosmology.
This version presents the final fixed manuscript of the quadratic velocity-dependent interacting dark sector model. The paper establishes: • Existence of a narrow viable parameter band (76 configurations) • Late-time localized interaction behavior • Controlled linear growth suppression governed primarily by amplitude variation • Consistency with current RSD measurements without statistical preference over ΛCDM Observable-space dimensional reduction results are presented separately in a forthcoming companion work. This version focuses strictly on model viability and phenomenological consistency.
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masaki okada (2026) studied this question.
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