Abstract
We examine the possibility that dark matter consists of charged massive particles (CHAMPs) in view of the cosmic microwave background (CMB) anisotropies. The evolution of cosmological perturbations of CHAMPs with other components is followed in a self-consistent manner, without assuming that CHAMPs and baryons are tightly coupled. We incorporate for the first time the “kinetic recoupling” of the Coulomb scattering, which is characteristic of heavy CHAMPs. By a direct comparison of the predicted CMB temperature/polarization autocorrelations in CHAMP models and the observed spectra in the Planck mission, we show that CHAMPs leave sizable effects on them if it is lighter than . Our result can be applicable to any CHAMP as long as its lifetime is much longer than the cosmic time at the recombination (). An application to millicharged particles is also discussed.
- Received 4 May 2016
DOI:https://doi.org/10.1103/PhysRevD.95.023502
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