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Eternal Universe Theory describes a novel cosmological model with ultralight axions, resolving the flatness problem and supporting observations from modern astrophysics.
EUT 4.2 is a complete, inflation-free cosmological model based on a single ultralight axion (m_a = 1.5×10⁻²¹ eV) as Fuzzy Dark Matter. Dark matter arises from vacuum misalignment at the Planck epoch. Primordial black holes (f_PBH < 0.01) serve exclusively as gravitational seeds. Cosmic voids amplify the axion density by a factor 2.02 through constructive interference of the de Broglie wave (λ_dB ≈ 0.88 kpc). The horizon and flatness problems are solved by a brief kinetic-dominated phase (w = 1) of the axion field before Planck time. All cosmological parameters emerge without fine-tuning and are in excellent agreement with current observations (Planck, DESI, SH0ES). The model is falsifiable by Euclid (void DM profiles), LISA (PBH mergers), and CMB-S4.
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