A charged massive spin-3/2 field in an Einstein-Maxwell background propagates consistently only when m^2 > 2q^2/3κ^2 − Λ/3, a bound rederived here and used to argue for Planck-scale charged gravitino dark matter.
Constraints on millicharged particles from Planck
2 Pith papers cite this work. Polarity classification is still indexing.
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Pith papers citing it
abstract
We revisit cosmic microwave background (CMB) constraints on the abundance of millicharged particles based on the Planck data. The stringent limit Omega_{mcp}h^2 < 0.001 (95% CL) may be set using the CMB data alone if millicharged particles participate in the acoustic oscillations of baryon-photon plasma at the recombination epoch. The latter condition is valid for a wide region of charges and masses of the particles. Adding the millicharged component to LCDM shifts prefered scalar spectral index of primordial perturbations to somewhat larger values as compared to minimal model, even approaching Harrison-Zeldovich spectrum under some assumptions.
representative citing papers
Proposes underground MeV-scale electron-beam production of millicharged or dipole fermions followed by CCD detection to access unconstrained parameter space.
citing papers explorer
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Planck mass gravitinos in Einstein-Maxwell backgrounds
A charged massive spin-3/2 field in an Einstein-Maxwell background propagates consistently only when m^2 > 2q^2/3κ^2 − Λ/3, a bound rederived here and used to argue for Planck-scale charged gravitino dark matter.
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Underground Production of Electromagnetic Dark States by MeV-scale Electron Beams and Detection with CCDs
Proposes underground MeV-scale electron-beam production of millicharged or dipole fermions followed by CCD detection to access unconstrained parameter space.