Research Paper#Cosmology, Dark Matter, ULDM, Hubble Tension, S8 Tension🔬 ResearchAnalyzed: Jan 3, 2026 15:39
ULDM Self-Interaction and Cosmological Tensions
Published:Dec 30, 2025 16:05
•1 min read
•ArXiv
Analysis
This paper investigates a potential solution to the Hubble constant ($H_0$) and $S_8$ tensions in cosmology by introducing a self-interaction phase in Ultra-Light Dark Matter (ULDM). It provides a model-independent framework to analyze the impact of this transient phase on the sound horizon and late-time structure growth, offering a unified explanation for correlated shifts in $H_0$ and $S_8$. The study's strength lies in its analytical approach, allowing for a deeper understanding of the interplay between early and late-time cosmological observables.
Key Takeaways
- •Proposes a ULDM model with a self-interaction phase to address cosmological tensions.
- •Develops a model-independent framework for analyzing the impact on the sound horizon and structure growth.
- •Provides an analytical understanding of the correlated shifts in $H_0$ and $S_8$ due to the self-interaction.
Reference
“The paper's key finding is that a single transient modification of the expansion history can interpolate between early-time effects on the sound horizon and late-time suppression of structure growth within a unified physical framework, providing an analytical understanding of their joint response.”