Probing Lepton Asymmetry with 21 cm Fluctuations
arXiv:1404.4847 · doi:10.1088/1475-7516/2014/09/014
Abstract
We investigate the issue of how accurately we can constrain the lepton number asymmetry xi_nu = mu_nu/T_nu in the Universe by using future observations of 21 cm line fluctuations and cosmic microwave background (CMB). We find that combinations of the 21 cm line and the CMB observations can constrain the lepton asymmetry better than big-bang nucleosynthesis (BBN). Additionally, we also discuss constraints on xi_nu in the presence of some extra radiation, and show that the 21 cm line observations can substantially improve the constraints obtained by CMB alone, and allow us to distinguish the effects of the lepton asymmetry from the ones of extra radiation.
22 pages, 4 figures
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- Constraints on the neutrino parameters by future cosmological 21cm line and precise CMB polarization observations
- Effect of supersonic relative motion between baryons and dark matter on collapsed objects
- Probing a panoply of curvaton-decay scenarios using CMB data
- Cosmology with the Square Kilometre Array by SKA-Japan
- Constraints on the lepton asymmetry from DESI DR2 BAO data