Reducing the H0 and σ8 tensions with dark matter-neutrino interactions

Di Valentino, Eleonora; Bœhm, Céline; Hivon, Eric; Bouchet, François R.

Abstract

The introduction of dark matter-neutrino interactions modifies the cosmic microwave background (CMB) angular power spectrum at all scales, thus affecting the reconstruction of the cosmological parameters. Such interactions can lead to a slight increase of the value of H 0 and a slight decrease of S 8 ≡ σ 8 √ Ω m / 0.3 , which can help reduce somewhat the tension between the CMB and weak lensing or Cepheids data sets. Here we show that it is impossible to solve both tensions simultaneously. While the 2015 Planck temperature and low multipole polarization data combined with the Cepheids data sets prefer large values of the Hubble rate (up to H 0 = 72.1 + 1.5 − 1.7     km / s / Mpc , when N eff is free to vary), the σ 8 parameter remains too large to reduce the σ 8 tension. Adding high multipole Planck polarization data does not help since this data shows a strong preference for low values of H 0 , thus worsening current tensions, even though they also prefer smaller value of σ 8 .

Citation

Di Valentino, E., Bœhm, C., Hivon, E., & Bouchet, F. R. (2018). Reducing the H0 and σ8 tensions with dark matter-neutrino interactions. Physical Review D, 97(4), Article 043513. https://doi.org/10.1103/physrevd.97.043513

• Journal Article Type: Article
• Acceptance Date: Oct 13, 2017
• Online Publication Date: Feb 13, 2018
• Publication Date: Feb 13, 2018
• Deposit Date: Mar 8, 2018
• Publicly Available Date: Mar 8, 2018
• Journal: Physical Review D
• Print ISSN: 2470-0010
• Electronic ISSN: 2470-0029
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 97
• Issue: 4
• Article Number: 043513
• DOI: https://doi.org/10.1103/physrevd.97.043513
• Public URL: https://durham-repository.worktribe.com/output/1338148