axions++ 2023

Cosmologically Varying Kinetic Mixing

27 sept. 2023, 10:50

20m

Auditorium Vivargent (LAPTh)

Cosmo

Orateur

Di Liu (CNRS-LAPTh)

Description

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, in our recent work arXiv:2302.03056, we construct the scalar-controlled kinetic mixing varying with the ultralight (${10}^{-33}\text{eV}<m_0\ll \text{eV}$) CP-even scalar's cosmological evolution. In this talk, I will introduce how do we naturally realize this and eliminate the constant mixing term. Via the time-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 protect the scalar naturalness, we discretely re-establish the broken shift symmetry by embedding the minimal model into the ${\mathbb{Z}}_N$-protected model.

Documents de présentation

timevarying_DL_LAPTh.pdf