## Sterile neutrino self-interactions: $H_0$ tension and short-baseline anomalies

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

### Standard

Sterile neutrino self-interactions: $H_0$ tension and short-baseline anomalies. / Archidiacono, Maria; Gariazzo, Stefano; Giunti, Carlo; Hannestad, Steen; Tram, Thomas.

In: Journal of Cosmology and Astroparticle Physics, No. 12, 029, 12.2020.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

### Harvard

Archidiacono, M, Gariazzo, S, Giunti, C, Hannestad, S & Tram, T 2020, 'Sterile neutrino self-interactions: $H_0$ tension and short-baseline anomalies', Journal of Cosmology and Astroparticle Physics, no. 12, 029. https://doi.org/10.1088/1475-7516/2020/12/029

### APA

Archidiacono, M., Gariazzo, S., Giunti, C., Hannestad, S., & Tram, T. (2020). Sterile neutrino self-interactions: $H_0$ tension and short-baseline anomalies. Journal of Cosmology and Astroparticle Physics, (12), [029]. https://doi.org/10.1088/1475-7516/2020/12/029

### CBE

Archidiacono M, Gariazzo S, Giunti C, Hannestad S, Tram T. 2020. Sterile neutrino self-interactions: $H_0$ tension and short-baseline anomalies. Journal of Cosmology and Astroparticle Physics. (12):Article 029. https://doi.org/10.1088/1475-7516/2020/12/029

### MLA

Archidiacono, Maria et al. "Sterile neutrino self-interactions: $H_0$ tension and short-baseline anomalies". Journal of Cosmology and Astroparticle Physics. 2020. (12). https://doi.org/10.1088/1475-7516/2020/12/029

### Vancouver

Archidiacono M, Gariazzo S, Giunti C, Hannestad S, Tram T. Sterile neutrino self-interactions: $H_0$ tension and short-baseline anomalies. Journal of Cosmology and Astroparticle Physics. 2020 Dec;(12). 029. https://doi.org/10.1088/1475-7516/2020/12/029

### Author

Archidiacono, Maria ; Gariazzo, Stefano ; Giunti, Carlo ; Hannestad, Steen ; Tram, Thomas. / Sterile neutrino self-interactions: $H_0$ tension and short-baseline anomalies. In: Journal of Cosmology and Astroparticle Physics. 2020 ; No. 12.

### Bibtex

@article{69fe6afccc454420b6091f7eb6d2a29a,
title = "Sterile neutrino self-interactions: $H_0$ tension and short-baseline anomalies",
abstract = "Sterile neutrinos with a mass in the eV range have been invoked as a possible explanation of a variety of short baseline (SBL) neutrino oscillation anomalies. However, if one considers neutrino oscillations between active and sterile neutrinos, such neutrinos would have been fully thermalised in the early universe, and would be therefore in strong conflict with cosmological bounds. In this study we first update cosmological bounds on the mass and energy density of eV-scale sterile neutrinos. We then perform an updated study of a previously proposed model in which the sterile neutrino couples to a new light pseudoscalar degree of freedom. Consistently with previous analyses, we find that the model provides a good fit to all cosmological data and allows the high value of $H_0$ measured in the local universe to be consistent with measurements of the cosmic microwave background. However, new high $\ell$ polarisation data constrain the sterile neutrino mass to be less than approximately 1 eV in this scenario. Finally, we combine the cosmological bounds on the pseudoscalar model with a Bayesian inference analysis of SBL data and conclude that only a sterile mass in narrow ranges around 1 eV remains consistent with both cosmology and SBL data.",
keywords = "Astrophysics - Cosmology and Nongalactic Astrophysics, High Energy Physics - Phenomenology",
author = "Maria Archidiacono and Stefano Gariazzo and Carlo Giunti and Steen Hannestad and Thomas Tram",
year = "2020",
month = dec,
doi = "10.1088/1475-7516/2020/12/029",
language = "English",
journal = "Journal of Cosmology and Astroparticle Physics",
issn = "1475-7516",
publisher = "IOP Publishing",
number = "12",

}

### RIS

TY - JOUR

T1 - Sterile neutrino self-interactions: $H_0$ tension and short-baseline anomalies

AU - Archidiacono, Maria

AU - Gariazzo, Stefano

AU - Giunti, Carlo

AU - Tram, Thomas

PY - 2020/12

Y1 - 2020/12

N2 - Sterile neutrinos with a mass in the eV range have been invoked as a possible explanation of a variety of short baseline (SBL) neutrino oscillation anomalies. However, if one considers neutrino oscillations between active and sterile neutrinos, such neutrinos would have been fully thermalised in the early universe, and would be therefore in strong conflict with cosmological bounds. In this study we first update cosmological bounds on the mass and energy density of eV-scale sterile neutrinos. We then perform an updated study of a previously proposed model in which the sterile neutrino couples to a new light pseudoscalar degree of freedom. Consistently with previous analyses, we find that the model provides a good fit to all cosmological data and allows the high value of $H_0$ measured in the local universe to be consistent with measurements of the cosmic microwave background. However, new high $\ell$ polarisation data constrain the sterile neutrino mass to be less than approximately 1 eV in this scenario. Finally, we combine the cosmological bounds on the pseudoscalar model with a Bayesian inference analysis of SBL data and conclude that only a sterile mass in narrow ranges around 1 eV remains consistent with both cosmology and SBL data.

AB - Sterile neutrinos with a mass in the eV range have been invoked as a possible explanation of a variety of short baseline (SBL) neutrino oscillation anomalies. However, if one considers neutrino oscillations between active and sterile neutrinos, such neutrinos would have been fully thermalised in the early universe, and would be therefore in strong conflict with cosmological bounds. In this study we first update cosmological bounds on the mass and energy density of eV-scale sterile neutrinos. We then perform an updated study of a previously proposed model in which the sterile neutrino couples to a new light pseudoscalar degree of freedom. Consistently with previous analyses, we find that the model provides a good fit to all cosmological data and allows the high value of $H_0$ measured in the local universe to be consistent with measurements of the cosmic microwave background. However, new high $\ell$ polarisation data constrain the sterile neutrino mass to be less than approximately 1 eV in this scenario. Finally, we combine the cosmological bounds on the pseudoscalar model with a Bayesian inference analysis of SBL data and conclude that only a sterile mass in narrow ranges around 1 eV remains consistent with both cosmology and SBL data.

KW - Astrophysics - Cosmology and Nongalactic Astrophysics

KW - High Energy Physics - Phenomenology

U2 - 10.1088/1475-7516/2020/12/029

DO - 10.1088/1475-7516/2020/12/029

M3 - Journal article

JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

SN - 1475-7516

IS - 12

M1 - 029

ER -