Joint CMB and BBN Constraints on Light Dark Sectors with Dark Radiation

Abstract

Dark sectors provide a compelling theoretical framework for thermally producing sub-GeV dark matter, and motivate an expansive new accelerator and direct-detection experimental program. We demonstrate the power of constraining such dark sectors using the measured effective number of neutrino species, $N_{\text{eff}}$, from the Cosmic Microwave Background (CMB) and primordial elemental abundances from Big Bang Nucleosynthesis (BBN). As a concrete example, we consider a dark matter particle of arbitrary spin that interacts with the Standard Model via a massive dark photon, accounting for an arbitrary number of light degrees of freedom in the dark sector. We exclude dark matter masses below $\sim$ 4 MeV at 95% confidence for all dark matter spins and dark photon masses. These bounds hold regardless of additional new light, inert degrees of freedom in the dark sector, and for dark matter-electron scattering cross sections many orders of magnitude below current experimental constraints. The strength of these constraints will only continue to improve with future CMB experiments.

5+22 pages, 3+1 figures. Updated to match PRL version

References in corpus (19)

• The NumPy array: a structure for efficient numerical computation
• Secluded WIMP Dark Matter
• Precise Relic WIMP Abundance and its Impact on Searches for Dark Matter Annihilation
• Asymmetric Dark Matter
• Primordial Nucleosynthesis: from precision cosmology to fundamental physics
• The WIMPless Miracle: Dark Matter Particles without Weak-scale Masses or Weak Interactions
• Light Dark Matter: Models and Constraints
• Study of the decay K+ => pi+,nu,nubar in the momentum region 140<Ppi<199 MeV/c
• Big Bang Nucleosynthesis as a Probe of New Physics
• (In)direct Detection of Boosted Dark Matter
• Refined Bounds on MeV-scale Thermal Dark Sectors from BBN and the CMB
• BBN And The CMB Constrain Neutrino Coupled Light WIMPs
• A new tension in the cosmological model from primordial deuterium?
• Primordial Deuterium after LUNA: concordances and error budget
• BBN constraints on the annihilation of MeV-scale dark matter
• The Impact of New d(p,γ)He3 Rates on Big Bang Nucleosynthesis
• Impact of Resonance on Thermal Targets for Invisible Dark Photon Searches
• Light Dark Matter through Assisted Annihilation
• On thermal production of self-interacting dark matter

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• Towards a full description of MeV dark matter decoupling: a self-consistent determination of relic abundance and $N_{\mathrm{eff}}$
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• Long-Lived Light Mediators from Higgs boson Decay at HL-LHC, FCC-hh and a Proposal of Dedicated LLP Detectors for FCC-hh
• LINX: A Fast, Differentiable, and Extensible Big Bang Nucleosynthesis Package
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