Cosmological Constraints on Very Dark Photons

Jul 3, 2014
14 pages
Published in:
  • Phys.Rev.D 90 (2014) 3, 035022
  • Published: Aug 25, 2014
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Abstract: (APS)

We explore the cosmological consequences of kinetically mixed dark photons with a mass between 1 MeV and 10 GeV and an effective electromagnetic fine structure constant as small as 10-38. We calculate the freeze-in abundance of these dark photons in the early universe and explore the impact of late decays on big bang nucleosynthesis and the cosmic microwave background. This leads to new constraints on the parameter space of mass mV vs kinetic mixing parameter κ.

Note:
  • 14 pages, 11 figures, references added
  • 12.60.Cn
  • 12.60.-i
  • 14.80.-j
  • 95.35.+d
  • fundamental constant: fine structure
  • cosmic background radiation
  • mixing: kinetic
  • nucleosynthesis: big bang
  • photon
  • dark matter