Cosmologically Varying Kinetic Mixing

Abstract

The portal connecting the invisible and visible sectors is one of the most natural explanations of the dark world. However, the early-time dark matter production via the portal faces extremely stringent late-time constraints. To solve such tension, we construct the scalar-controlled kinetic mixing varying with the ultralight CP-even scalar's cosmological evolution. To realize this and eliminate the constant mixing, we couple the ultralight scalar within $10^{-33}\text{eV}\lesssim m_0\ll \text{eV}$ with the heavy doubly charged messengers and impose the ${\mathbb{Z}}_2$ symmetry under the dark charge conjugation. Via the varying mixing, the $\text{keV}-\text{MeV}$ dark photon dark matter is produced through the early-time freeze-in when the scalar is misaligned from the origin and free from the late-time exclusions when the scalar does the damped oscillation and dynamically sets the kinetic mixing. We also find that the scalar-photon coupling emerges from the underlying physics, which changes the cosmological history and provides the experimental targets based on the fine-structure constant variation and the equivalence principle violation. To ensure the scalar naturalness, we discretely re-establish the broken shift symmetry by embedding the minimal model into the ${\mathbb{Z}}_N$-protected model. When $N\sim 10$, the scalar's mass quantum correction can be suppressed much below $10^{-33}\text{eV}$.

arXiv commentv2: 26 pages, 3 appendices, 10 figures, main text streamlined, references added, results and conclusions unchanged

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