Cosmic structure formation in a flavoured U$\left(1\right)$ dark sector at small scales

Abstract

In this work we study the footprint of a secluded dark sector with a U$\left(1\right)$ gauge symmetry on the formation of cosmic structure at small scales. A single generation of dark fermions with mass in the TeV range is able to elegantly solve all small-scale issues of structure formation, while still being consistent with the cosmological history of the universe. A new interaction at the MeV scale is introduced for this purpose. As a generalization we consider multiple generations of fermions as well and show that such extensions are also cosmologically viable and allow a more flexible choice of the parameters of the theory.

arXiv comment13 pages

References in corpus (20)

• Dark Matter Self-interactions and Small Scale Structure
• Subhaloes in Self-Interacting Galactic Dark Matter Haloes
• Dark Matter Halos as Particle Colliders: A Unified Solution to Small-Scale Structure Puzzles from Dwarfs to Clusters
• One percent determination of the primordial deuterium abundance
• New Constraints on the free-streaming of warm dark matter from intermediate and small scale Lyman-$\alpha$ forest data
• Beyond Collisionless Dark Matter: Particle Physics Dynamics for Dark Matter Halo Structure
• The unexpected diversity of dwarf galaxy rotation curves
• Constraining Self-Interacting Dark Matter with the Milky Way's dwarf spheroidals
• Damping scales of neutralino cold dark matter
• Is dark matter with long-range interactions a solution to all small-scale problems of ΛCDM cosmology?
• ETHOS - An Effective Theory of Structure Formation: Dark matter physics as a possible explanation of the small-scale CDM problems
• ETHOS - An Effective Theory of Structure Formation: From dark particle physics to the matter distribution of the Universe
• Mirror dark matter: Cosmology, galaxy structure and direct detection
• A ménage à trois of eV-scale sterile neutrinos, cosmology, and structure formation
• Constraining Dark Matter candidates from structure formation
• Supernova Bounds on the Dark Photon Using its Electromagnetic Decay
• $\nu \Lambda$MDM: A Model for Sterile Neutrino and Dark Matter Reconciles Cosmological and Neutrino Oscillation Data after BICEP2
• Thermal decoupling and the smallest subhalo mass in dark matter models with Sommerfeld-enhanced annihilation rates
• Dark matter-radiation interactions: the structure of Milky Way satellite galaxies
• Search for Neutrinos from Annihilating Dark Matter in the Direction of the Galactic Center with the 40-String IceCube Neutrino Observatory