A Hidden Dark Matter Sector, Dark Radiation, and the CMB

Abstract

We consider theories where dark matter is composed of a thermal relic of weak scale mass, whose couplings to the Standard Model (SM) are however too small to give rise to the observed abundance. Instead, the abundance is set by annihilation to light hidden sector states that carry no charges under the SM gauge interactions. In such a scenario the constraints from direct and indirect detection, and from collider searches for dark matter, can easily be satisfied. The masses of such light hidden states can be protected by symmetry if they are Nambu-Goldstone bosons, fermions, or gauge bosons. These states can then contribute to the cosmic energy density as dark radiation, leading to observable signals in the cosmic microwave background (CMB). Furthermore, depending on whether or not the light hidden sector states self-interact, the fraction of the total energy density that free-streams is either decreased or increased, leading to characteristic effects on both the scalar and tensor components of the CMB anisotropy that allows these two cases to be distinguished. The magnitude of these signals depends on the number of light degrees of freedom in the hidden sector, and on the temperature at which it kinetically decouples from the SM. We consider a simple model that realizes this scenario, based on a framework in which the SM and hidden sector are initially in thermal equilibrium through the Higgs portal, and show that the resulting signals are compatible with recent Planck results, while large enough to be detected in upcoming experiments such as CMBPol and CMB Stage-IV. Invisible decays of the Higgs into hidden sector states at colliders can offer a complementary probe of this model.

15 pages, 5 figures. Version published in PRD

References in corpus (23)

• Dark Matter Results from 225 Live Days of XENON100 Data
• Secluded WIMP Dark Matter
• The WIMPless Miracle: Dark Matter Particles without Weak-scale Masses or Weak Interactions
• Dark Matter and Dark Radiation
• Cores in Dwarf Galaxies from Dark Matter with a Yukawa Potential
• Exciting Dark Matter and the INTEGRAL/SPI 511 keV signal
• Is dark matter with long-range interactions a solution to all small-scale problems of ΛCDM cosmology?
• Search for invisible decays of Higgs bosons in the vector boson fusion and associated ZH production modes
• Resonant Dark Forces and Small Scale Structure
• (In)direct Detection of Boosted Dark Matter
• Non-Abelian dark matter and dark radiation
• Candidates for Inelastic Dark Matter
• Diurnal modulation signal from dissipative hidden sector dark matter
• High Energy Positrons and the WMAP Haze from Exciting Dark Matter
• Detecting Boosted Dark Matter from the Sun with Large Volume Neutrino Detectors
• Dark Radiation Emerging After Big Bang Nucleosynthesis?
• Cosmology of neutrinos and extra light particles after WMAP3
• A theory of extra radiation in the Universe
• Dark Radiation and interacting scenarios
• The Top Window for dark matter
• Constraining Fundamental Physics with Future CMB Experiments
• Signatures of Top Flavored Dark Matter
• Tensor Microwave Background Fluctuations for Large Multipole Order

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