Improved constraints on lepton asymmetry from the cosmic microwave background

Oldengott IM, Schwarz D (2017)
Europhysics Letters 119(2): 29001.

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Abstract
A cosmic lepton asymmetry ηl=(nl−nl¯)/nγ affects the primordial helium abundance and the expansion rate of the early Universe. Both of these effects have an impact on the anisotropies of the cosmic microwave background (CMB). We derive constraints on the neutrino chemical potentials from the Planck 2015 data, assuming equal lepton flavour asymmetries and negligible neutrino masses. We find ξ=−0.002+0.114−0.111 (95\% CL) for the chemical potentials, which corresponds to −0.085≤ηl≤0.084. Our constraints on the lepton asymmetry are significantly stronger than previous constraints from CMB data analysis and we argue that they are more robust than those from primordial light element abundances. The resulting constraints on the primordial helium and deuterium abundances are consistent with those from direct measurements.
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Oldengott IM, Schwarz D. Improved constraints on lepton asymmetry from the cosmic microwave background. Europhysics Letters. 2017;119(2): 29001.
Oldengott, I. M., & Schwarz, D. (2017). Improved constraints on lepton asymmetry from the cosmic microwave background. Europhysics Letters, 119(2), 29001. doi:10.1209/0295-5075/119/29001
Oldengott, I. M., and Schwarz, D. (2017). Improved constraints on lepton asymmetry from the cosmic microwave background. Europhysics Letters 119:29001.
Oldengott, I.M., & Schwarz, D., 2017. Improved constraints on lepton asymmetry from the cosmic microwave background. Europhysics Letters, 119(2): 29001.
I.M. Oldengott and D. Schwarz, “Improved constraints on lepton asymmetry from the cosmic microwave background”, Europhysics Letters, vol. 119, 2017, : 29001.
Oldengott, I.M., Schwarz, D.: Improved constraints on lepton asymmetry from the cosmic microwave background. Europhysics Letters. 119, : 29001 (2017).
Oldengott, Isabel Mira, and Schwarz, Dominik. “Improved constraints on lepton asymmetry from the cosmic microwave background”. Europhysics Letters 119.2 (2017): 29001.
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Constraints on particle properties from the cosmic microwave background
Oldengott IM (2017)
Bielefeld: Universität Bielefeld.

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