This paper extends the cosmological analysis of the damped harmonic oscillator scalar field (-field) to the extreme conditions of the Early Universe, specifically the Radiation Era, Cosmic Microwave Background (CMB), and Big Bang Nucleosynthesis (BBN). Using the fixed structural constants derived from late-time observations (A 0. 25, m 3. 0, H₀ = 67. 07 km/s/Mpc, and ₘ = 0. 3007), we demonstrate that the model exhibits exceptional numerical stability. The system resolves the angular scale of the CMB acoustic peaks (_*) with an extraordinary precision deviation of only 0. 000457\% compared to the Planck 2018 data, calibration-fixing the baryon fraction at b = 0. 01498. Furthermore, during the first three minutes of the Universe, the field introduces a 4. 8\% acceleration in the expansion rate (Hₑ₀ₓ₈₎ = 1. 0482), which naturally balances the lower baryon density to yield a primordial Helium-4 mass fraction of 24. 94\% (within 1. 78\% of observational data). Crucially, the reduced baryon density drastically suppresses primordial Lithium-7 production to 0. 30 10^-10, offering a robust and elegant solution to the long-standing cosmological "Lithium Problem" without invoking any extra parameter or fine-tuning.
Josip Zencic (Sat,) studied this question.