A Model of Interacting Dark Matter and Dark Radiation for $H_0$ and ${\sigma }_8$ Tensions

Abstract

We present a model describing the dark sector (DS) featured by two interactions remaining efficient until late times in the matter-dominated era after recombination: the interaction among dark radiations (DR), and the interaction between a small fraction of dark matter and dark radiation. The dark sector consists of (1) a dominant component cold collisionless DM (DM1), (2) a sub-dominant cold DM (DM2) and (3) a self-interacting DR. When a sufficient amount of DR is ensured and a few percent of the total DM density is contributed by DM2 interacting with DR, this set-up is known to be able to resolve both the Hubble and ${\sigma }_8$ tension. In light of this, we propose a scenario which is logically natural and has an intriguing theoretical structure with a hidden unbroken gauge group $\mathrm{SU}(5{)}_{\mathrm{X}}\otimes \mathrm{U}(1{)}_{\mathrm{X}}$. Our model of the dark sector does not introduce any new scalar field, but contains only massless chiral fermions and gauge fields in the ultraviolet (UV) regime. As such, it introduces a new scale (DM2 mass, $m_{DM2}$) based on the confinement resulting from the strong dynamics of $\mathrm{SU}(5{)}_{\mathrm{X}}$. Both DM2-DR and DR-DR interactions are attributed to an identical long range interaction of $\mathrm{U}(1{)}_{\mathrm{X}}$. We show that our model can address the cosmological tensions when it is characterized by $g_{\mathrm{X}}=\mathcal{O}(10^{-3})-\mathcal{O}(10^{-2})$, $m_{DM2}=\mathcal{O}(1)-\mathcal{O}(100)\mathrm{GeV}$ and $T_{\mathrm{DS}}/T_{\mathrm{SM}}\simeq 0.3-0.4$ where $g_{\mathrm{X}}$ is the gauge coupling of $\mathrm{U}(1{)}_{\mathrm{X}}$ and $T_{\mathrm{DS}}$ ($T_{\mathrm{SM}}$) is a temperature of the DS (Standard Model sector). Our model explains candidates of DM2 and DR, and DM1 can be any kind of CDM.

8 pages, 1 figure, published version in JHEP

References in corpus (14)

• Too big to fail? The puzzling darkness of massive Milky Way subhaloes
• Symmetries and Strings in Field Theory and Gravity
• H0LiCOW V. New COSMOGRAIL time delays of HE0435-1223: $H_0$ to 3.8% precision from strong lensing in a flat $\Lambda$CDM model
• A precision calculation of relic neutrino decoupling
• Late universe decaying dark matter can relieve the H_0 tension
• Interacting Dark Sector and Precision Cosmology
• Dark sector interaction: a remedy of the tensions between CMB and LSS data
• Interacting radiation after Planck and its implications for the Hubble Tension
• Light dark photon and fermionic dark radiation for the Hubble constant and the structure formation
• Residual Non-Abelian Dark Matter and Dark Radiation
• Partially Acoustic Dark Matter Cosmology and Cosmological Constraints
• Hidden Charged Dark Matter and Chiral Dark Radiation
• Cannibalism hinders growth: Cannibal Dark Matter and the $S_8$ tension
• Number-Theory Dark Matter

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