A testable hidden-sector model for Dark Matter and neutrino masses

Abstract

We consider a minimal extension of the Standard Model with a hidden sector charged under a dark local $U(1{)}^{\prime }$ gauge group, accounting simultaneously for light neutrino masses and the observed Dark Matter relic abundance. The model contains two copies of right-handed neutrinos which give rise to light neutrino-masses via an extended seesaw mechanism. The presence of a stable Dark-Matter candidate and a massless state naturally arise by requiring the simplest anomaly-free particle content without introducing any extra symmetries. We investigate the phenomenology of the hidden sector considering the $U(1{)}^{\prime }$ breaking scale of the order of the electroweak scale. Confronting the thermal history of this hidden-sector model with existing and future constraints from collider, direct and indirect detection experiments provides various possibilities of probing the model in complementary ways as every particle of the dark sector plays a specific cosmological role. Across the identified viable parameter space, a large region predicts a sizable contribution to the effective relativistic degrees-of-freedom in the early Universe that allows to alleviate the recently reported tension between late and early measurements of the Hubble constant.

38 pages, 5 figures. v2: Matches the published version, typos fixed, references added

References in corpus (21)

• Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics Beyond LambdaCDM
• The Reactor Antineutrino Anomaly
• Precise Relic WIMP Abundance and its Impact on Searches for Dark Matter Annihilation
• The trouble with $H_0$
• The Dawn of FIMP Dark Matter: A Review of Models and Constraints
• Statistical Significance of the Gallium Anomaly
• Illuminating Dark Photons with High-Energy Colliders
• Relic neutrino decoupling with flavour oscillations revisited
• Cosmology With a Very Light $L_{\mu }-L_{\tau }$ Gauge Boson
• Kinetic Mixing as the Origin of Light Dark Scales
• Light Sterile Neutrinos: Models and Phenomenology
• Limits on nu_e and anti-nu_e disappearance from Gallium and reactor experiments
• Toward (Finally!) Ruling Out Z and Higgs Mediated Dark Matter Models
• Enhancement of the Dark Matter Abundance Before Reheating: Applications to Gravitino Dark Matter
• Z-portal dark matter
• Sterile Neutrinos or Flux Uncertainties? - Status of the Reactor Anti-Neutrino Anomaly
• The light U boson as the mediator of a new force, coupled to a combination of Q, B, L and dark matter
• Vector SIMP dark matter
• Right-handed neutrino production rate at T > 160 GeV
• Neutrino Masses from a Dark Neutrino Sector below the Electroweak Scale
• Dark Matter and the elusive ${\mathbf{Z}}^{\prime }$ in a dynamical Inverse Seesaw scenario

Cited by in corpus (11)

• Seven hints that early-time new physics alone is not sufficient to solve the Hubble tension
• Gravity as a Portal to Reheating, Leptogenesis and Dark Matter
• Analyzing the Hubble tension through hidden sector dynamics in the early universe
• Dark Matter Freeze-In with a Heavy Mediator: Beyond the EFT Approach
• Indirect Signals of Dark Matter Can Change Depending on Where You Look
• WIMP Dark Matter in the U$\mu \nu$SSM
• From oversimplified to overlooked: the case for exploring Rich Dark Sectors
• Particle physics and cosmology intertwined
• Roads for Right-handed Neutrino Dark Matter: Fast Expansion, Standard Freeze-out, and Early Matter Domination
• Effective ALP-Photon Coupling in External Magnetic Fields
• A Faster Growth of Perturbations in an Early Matter Dominated Epoch: Primordial Black Holes and Gravitational Waves