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Title: Interacting radiation after Planck and its implications for the Hubble tension

Abstract

Standard cosmology predicts that prior to matter-radiation equality about 41% of the energy density was in free-streaming neutrinos. In many beyond Standard Model scenarios, however, the amount and free-streaming nature of this component is modified. For example, this occurs in models with new neutrino self-interactions or an additional dark sector with interacting light particles. Here, we consider several extensions of the standard cosmology that include a non-free-streaming radiation component as motivated by such particle physics models and use the final Planck data release to constrain them. This release contains significant improvements in the polarization likelihood which plays an important role in distinguishing free-streaming from interacting radiation species. Fixing the total amount of energy in radiation to match the expectation from standard neutrino decoupling we find that the fraction of free-streaming radiation must be ffs > 0.8 at 95% CL (combining temperature, polarization and baryon acoustic oscillation data). Allowing for arbitrary contributions of free-streaming and interacting radiation, the effective number of new non-free-streaming degrees of freedom is constrained to be Nfld < 0.6 at 95% CL. Cosmologies with additional radiation are also known to ease the discrepancy between the local measurement and CMB inference of the current expansion rate H0. We show that including amore » non-free-streaming radiation component allows for a larger amount of total energy density in radiation, leading to a mild improvement of the fit to cosmological data compared to previously discussed models with only a free-streaming component.« less

Authors:
 [1]; ORCiD logo [2]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, IL (United States)
  2. Johns Hopkins Univ., Baltimore, MD (United States); Univ. of Maryland, College Park, MD (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
OSTI Identifier:
1614733
Report Number(s):
arXiv:2003.08387; FERMILAB-PUB-20-114-A-T
Journal ID: ISSN 1475-7516; oai:inspirehep.net:1787042
Grant/Contract Number:  
AC02-07CH11359; PHY-1914480; PHY-1914731; NSF PHY-1748958
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2020; Journal Issue: 09; Journal ID: ISSN 1475-7516
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; cosmological parameters from CMBR; cosmology of theories beyond the SM; particle physics - cosmology connection

Citation Formats

Blinov, Nikita, and Marques-Tavares, Gustavo. Interacting radiation after Planck and its implications for the Hubble tension. United States: N. p., 2020. Web. doi:10.1088/1475-7516/2020/09/029.
Blinov, Nikita, & Marques-Tavares, Gustavo. Interacting radiation after Planck and its implications for the Hubble tension. United States. doi:10.1088/1475-7516/2020/09/029.
Blinov, Nikita, and Marques-Tavares, Gustavo. Tue . "Interacting radiation after Planck and its implications for the Hubble tension". United States. doi:10.1088/1475-7516/2020/09/029.
@article{osti_1614733,
title = {Interacting radiation after Planck and its implications for the Hubble tension},
author = {Blinov, Nikita and Marques-Tavares, Gustavo},
abstractNote = {Standard cosmology predicts that prior to matter-radiation equality about 41% of the energy density was in free-streaming neutrinos. In many beyond Standard Model scenarios, however, the amount and free-streaming nature of this component is modified. For example, this occurs in models with new neutrino self-interactions or an additional dark sector with interacting light particles. Here, we consider several extensions of the standard cosmology that include a non-free-streaming radiation component as motivated by such particle physics models and use the final Planck data release to constrain them. This release contains significant improvements in the polarization likelihood which plays an important role in distinguishing free-streaming from interacting radiation species. Fixing the total amount of energy in radiation to match the expectation from standard neutrino decoupling we find that the fraction of free-streaming radiation must be ffs > 0.8 at 95% CL (combining temperature, polarization and baryon acoustic oscillation data). Allowing for arbitrary contributions of free-streaming and interacting radiation, the effective number of new non-free-streaming degrees of freedom is constrained to be Nfld < 0.6 at 95% CL. Cosmologies with additional radiation are also known to ease the discrepancy between the local measurement and CMB inference of the current expansion rate H0. We show that including a non-free-streaming radiation component allows for a larger amount of total energy density in radiation, leading to a mild improvement of the fit to cosmological data compared to previously discussed models with only a free-streaming component.},
doi = {10.1088/1475-7516/2020/09/029},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 09,
volume = 2020,
place = {United States},
year = {2020},
month = {9}
}

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