November 22, 2025Open Access

EUT - Temperature-Dependent Ultralight Scalar Cosmology v5.1 Early Stiff Phase and kpc-Scale Dwarf Galaxy Cores without Inflation

Key Points

Prolonged massless phase addresses horizon and flatness problems, leading to inflation-free cosmology.
A mass of approximately 3 × 10⁻¹⁹ eV yields solitonic cores of 1.1–1.8 kpc in 10⁸–10⁹ M⊙ dwarf galaxies.
Observational analysis predicts deviations from ΛCDM on scales of 0.5–5 kpc, enabling tests with advanced telescopes.
Findings suggest clear implications for understanding dark matter dynamics and cosmological evolution.

Abstract

We explore a minimal, inflation-free cosmology driven by an ultralight axion-like particle (ALP) whose mass is strongly temperature-dependent. Above ∼100 GeV the field is effectively massless, producing a prolonged kinetic-dominated stiff-matter phase (w = +1) lasting ∼64 e-folds that substantially ameliorates the horizon and flatness problems. At late times the zero-temperature mass is mₐ ≈ 3 × 10⁻¹⁹ eV, yielding solitonic cores of radius 1. 1–1. 8 kpc in 10⁸–10⁹ M⊙ dwarf galaxies — in excellent agreement with observed core sizes. As of November 2025, this mass sits near the edge of the still-viable region allowed by black-hole superradiance constraints, with some analyses excluding it and others permitting it depending on the treatment of higher modes and mild self-interactions. The model predicts clear, falsifiable deviations from ΛCDM on 0. 5–5 kpc scales testable with upcoming Euclid, LSST, and 30-m class telescope data. Have a look also at my other work: Eternal Universe Theory – Mirror Edition E (u₁) = –E (u₂) A Two-Sheeted Energy-Antisymmetric Cosmology https: //zenodo. org/records/17683904

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