Self-interacting Dark Radiation

Abstract

We consider a simple class of models where dark radiation has self-interactions and therefore does not free stream. Such dark radiation has no anisotropic stress (or viscosity), leaving a distinct signature on the CMB angular power spectrum. Specifically we study a possibility that hidden gauge bosons and/or chiral fermions account for the excess of the effective number of neutrino species. They have gauge interactions and remain light due to the unbroken hidden gauge symmetry, leading to ΔN_{\rm eff} \simeq 0.29 in some case.

14 pages, 3 figures; v3: references added, published version

References in corpus (15)

• The Next-to-Minimal Supersymmetric Standard Model
• The Next-to-Minimal Supersymmetric extension of the Standard Model reviewed
• Naturally Light Hidden Photons in LARGE Volume String Compactifications
• The Cosmology of Atomic Dark Matter
• Illuminating the Hidden Sector of String Theory by Shining Light through a Magnetic Field
• The Case for Dark Radiation
• Cosmological Signatures of Interacting Neutrinos
• Gamma rays and positrons from a decaying hidden gauge boson
• Increasing the effective number of neutrinos with decaying particles
• Anomaly-Free Sets of Fermions
• Cosmology of neutrinos and extra light particles after WMAP3
• A theory of extra radiation in the Universe
• Constraints on neutrino and dark radiation interactions using cosmological observations
• Chaotic Inflation with a Fractional Power-Law Potential in Strongly Coupled Gauge Theories
• Number-Theory Dark Matter

Cited by in corpus (30)

• The Neutrino Puzzle: Anomalies, Interactions, and Cosmological Tensions
• Non-Abelian dark matter and dark radiation
• The QCD Axion from Aligned Axions and Diphoton Excess
• Limits on Neutrino-Neutrino Scattering in the Early Universe
• Interacting radiation after Planck and its implications for the Hubble Tension
• Non-Abelian Dark Forces and the Relic Densities of Dark Glueballs
• A Hidden Dark Matter Sector, Dark Radiation, and the CMB
• Light dark photon and fermionic dark radiation for the Hubble constant and the structure formation
• Cosmological Constraints on Interacting Light Particles
• $\Lambda$CDM or self-interacting neutrinos? - how CMB data can tell the two models apart
• Singlet extensions and W boson mass in the light of the CDF II result
• Redshift Effects in Particle Production from Kerr Primordial Black Holes
• Strongly broken Peccei-Quinn symmetry in the early Universe
• Free-streaming and Coupled Dark Radiation Isocurvature Perturbations: Constraints and Application to the Hubble Tension
• Confronting interacting dark radiation scenarios with cosmological data
• Nonthermal production of dark radiation and dark matter
• Probing neutrino interactions and dark radiation with gravitational waves
• Axions as Hot and Cold Dark Matter
• Probing a light dark sector at future lepton colliders via invisible decays of the SM-like and dark Higgs bosons
• Alternative $[SU(3){]}^4$ Model of Leptonic Color and Dark Matter
• Free-Streaming Neutrinos and Their Phase Shift in Current and Future CMB Power Spectra
• Abundance and properties of dark radiation from the cosmic microwave background
• Anthropic Bound on Dark Radiation and its Implications for Reheating
• Self-interacting neutrinos, the Hubble parameter tension, and the Cosmic Microwave Background
• Quartified Leptonic Color, Bound States, and Future Electron-Positron Collider
• Dark Photon as Fractional Cosmic Neutrino Masquerader
• Vortex solutions in the presence of Dark Portals
• A flexible parameterization to test early physics solutions to the Hubble tension with future CMB data
• Dark Acoustic Oscillations as an Early-Universe Explanation of the DESI Anomaly
• Disappearing Inflaton Potential via Heavy Field Dynamics