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

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

doi:10.1103/physrevd.97.043513

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

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

Authors

Eleonora Di Valentino

Céline Bœhm

Eric Hivon

François R. Bouchet

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

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Copyright Statement
Reprinted with permission from the American Physical Society: Di Valentino, Eleonora, Bœhm, Céline, Hivon, Eric & Bouchet, François R. (2018). Reducing the H0 and σ8 tensions with dark matter-neutrino interactions. Physical Review D 97(4): 043513 © 2018 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.