Alleviating Cosmological Tensions with a Coupled Scalar Fields Model

Understand

In this paper, we investigate the interaction between early dark energy (EDE) and scalar field dark matter, proposing a coupled scalar fields model to address the Hubble tension and $S_8$ tension.

• While the EDE model successfully alleviates the Hubble tension, it exacerbates the $S_8$ tension.
• To mitigate the negative impact of EDE, we introduce the interaction between EDE and dark matter.
• Specifically, we replace cold dark matter with scalar field dark matter, given its capability to suppress structure growth on small scales.