Search Publications

Improved constraints on lepton asymmetry from the cosmic microwave background

Schwarz, Dominik J.; Oldengott, Isabel M.

A cosmic lepton asymmetry η_\text{l}=(n_\text{l}-n_\bar{\text{l}})/n_γ 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 potent…

Implications of the Planck bispectrum constraints for the primordial trispectrum

Byrnes, Christian T.; Nurmi, Sami; Tasinato, Gianmassimo +1 more

The new Planck constraints on the local bispectrum parameter f_NL are about 10⁵ times tighter than the current constraints on the trispectrum parameter g_NL , which means that the allowed numerical values of the second-and third-order terms in the perturbative expansion of the curvature perturbation are comparable. We show that a conseq…