A Unified Scalar-Field Mechanism for the H 0, S 8 and Evolving Dark-Energy Tensions
This model uses a single scalar field with a smooth potential, featuring both a localized bump and an exponential tail, to solve three major cosmological puzzles: the $H_0$ tension, the $S_8$ tension (structure growth), and evolving dark energy. The early bump boosts expansion before recombination to fix $H_0$, while the late tail drives quintessence-like evolution to explain dark energy changes and suppress structure growth.