Geometric Origin of Dark Components: A Causal-Asymmetry Hypothesis

This work presents a geometric–causal–asymmetry hypothesis in which the apparent dark components of the cosmological energy budget — dark matter and dark energy — are not new physical entities but emergent consequences of the causal structure of the cosmological horizon system. Ordinary baryonic matter, together with the geometric scales RH (Hubble radius), REH (event horizon), and RPH (particle horizon), are taken as the only fundamental inputs. Under a causal-asymmetry sign-reversal postulate, the gravitational influence of baryonic mass in the spherical shell between REH and RPH on an observer at the origin reproduces the Friedmann acceleration H ²· (_ − ₘ/2) ·REH at the event horizon. Equating these two expressions yields the ₀ Ω Λ Ω central identity: (b / 2) · (RPH³ − REH³) / REH³ = _ − ₘ / 2 Ω Ω Λ Ω which agrees with Planck 2018 measurements to 0. 30%. A robustness scan over alternative cosmologies confirms that this agreement is not a tautological consequence of flat-FRW geometry. Combining this single identity with the observed flatness condition ₘ + _ = 1 yields explicit Ω Ω Λ predictions for all three remaining cosmological density parameters in terms of b and the horizon Ω geometry alone: ₘ = 2 (1 − X) /3, _ = (1 + 2X) /3, c = ₘ − b Ω Ω Λ Ω Ω Ω where X is the left-hand side of the central identity. Numerically, the predictions match Planck 2018 measurements to 0. 02% (ₘ), 0. 23% (_), and 0. 02% (c). The 95% of the cosmic energy budget Ω Ω Λ Ω that CDM attributes to unobserved components is, in this framework, a derived consequence of the Λ observed baryon density and the horizon geometry. The hypothesis additionally provides a natural geometric interpretation of the MOND acceleration scale a = cH / (2): the factor 2 is the cosmic circumference scale, and a corresponds to the gravitational ₀ ₀ π π ₀ acceleration whose Rindler horizon equals 2 ·RH. This connects galactic rotation-curve phenomenology πto cosmological geometry through a single causal structure. Open theoretical questions include the first-principles derivation of the sign-reversal mechanism and the framework's self-consistent dynamicalextension.