Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Cosmological Model Insensitivity of Local H-0 from the Cepheid Distance Ladder
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).ORCID iD: 0000-0002-4163-4996
Show others and affiliations
Number of Authors: 62020 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 894, no 1, article id 54Article in journal (Refereed) Published
Abstract [en]

The observed tension (similar to 9% difference) between the local distance ladder measurement of the Hubble constant, H-0, and its value inferred from the cosmic microwave background could hint at new, exotic, cosmological physics. We test the impact of the assumption about the expansion history of the universe on the local distance ladder estimate of H-0. In the fiducial analysis, the Hubble flow Type Ia supernova (SN Ia) sample is truncated to z < 0.15, and the deceleration parameter (q(0)) is fixed to -0.55. We create realistic simulations of the calibrator and Pantheon samples, and account for a full systematics covariance between these two sets. We fit several physically motivated dark-energy models, and derive combined constraints from calibrator and Pantheon SNe Ia and simultaneously infer H-0 and dark-energy properties. We find that the assumption on the dark-energy model does not significantly change the local distance ladder value of H-0, with a maximum difference (Delta H-0) between the inferred value for different models of 0.47 km, i.e., a 0.6% shift in H-0, significantly smaller than the observed tension. Additional freedom in the dark-energy models does not increase the error in the inferred value of H-0. Including systematics covariance between the calibrators, low-redshift SNe, and high-redshift SNe can induce small shifts in the inferred value for H-0. The SN Ia systematics in this study contribute less than or similar to 0.8% to the total uncertainty of H-0.

Place, publisher, year, edition, pages
2020. Vol. 894, no 1, article id 54
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-183141DOI: 10.3847/1538-4357/ab7fb0ISI: 000532443700001Scopus ID: 2-s2.0-85085317700OAI: oai:DiVA.org:su-183141DiVA, id: diva2:1451919
Available from: 2020-07-03 Created: 2020-07-03 Last updated: 2022-11-08Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopusarXiv:2001.09260

Authority records

Dhawan, SuhailGoobar, Ariel

Search in DiVA

By author/editor
Dhawan, SuhailGoobar, Ariel
By organisation
Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
In the same journal
Astrophysical Journal
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 45 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf