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Title: Model independent expansion history from supernovae: Cosmology versus systematics

Abstract

We examine the Pantheon supernovae distance data compilation in a model independent analysis to test the validity of cosmic history reconstructions beyond the concordance $$\Lambda$$CDM cosmology. Strong deviations are allowed by the data at $$z\gtrsim1$$ in the reconstructed Hubble parameter, $Om$ diagnostic, and dark energy equation of state. We explore three interpretations: 1) possibility of the true cosmology being far from $$\Lambda$$CDM, 2) supernovae property evolution, and 3) survey selection effects. The strong (and theoretically problematic) deviations at $$z\gtrsim1$$ vanish and good consistency with $$\Lambda$$CDM is found with a simple Malmquist-like linear correction. The adjusted data is robust against the model independent iterative smoothing reconstruction. However, we caution that while by eye the original deviation from $$\Lambda$$CDM is striking, $$\chi^2$$ tests do not show the extra linear correction parameter is statistically significant, and a model-independent Gaussian Process regression does not find significant evidence for the need for correction at high-redshifts.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3];  [4]
  1. Korea Astronomy and Space Science Institute, Yuseong-gu, Daedeok-daero 776, Daejeon 34055, Korea
  2. Korea Astronomy and Space Science Institute, Yuseong-gu, Daedeok-daero 776, Daejeon 34055, Korea, University of Science and Technology, Yuseong-gu 217 Gajeong-ro, Daejeon 34113, Korea
  3. Korea Astronomy and Space Science Institute, Yuseong-gu, Daedeok-daero 776, Daejeon 34055, Korea, Lawrence Berkeley National Lab, 1 Cyclotron Rd., Berkeley, CA, 94720, Energetic Cosmos Laboratory, Nazarbayev University, Astana, Kazakhstan
  4. Lawrence Berkeley National Lab, 1 Cyclotron Rd., Berkeley, CA, 94720
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1499212
Alternate Identifier(s):
OSTI ID: 1582036
Grant/Contract Number:  
SC0007867; AC02-05CH11231
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 485 Journal Issue: 2; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Country of Publication:
United Kingdom
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; methods: statistical; cosmological parameters; distance scale; cosmology: observations; cosmology: theory

Citation Formats

L’Huillier, Benjamin, Shafieloo, Arman, Linder, Eric V., and Kim, Alex G. Model independent expansion history from supernovae: Cosmology versus systematics. United Kingdom: N. p., 2019. Web. doi:10.1093/mnras/stz589.
L’Huillier, Benjamin, Shafieloo, Arman, Linder, Eric V., & Kim, Alex G. Model independent expansion history from supernovae: Cosmology versus systematics. United Kingdom. doi:10.1093/mnras/stz589.
L’Huillier, Benjamin, Shafieloo, Arman, Linder, Eric V., and Kim, Alex G. Sat . "Model independent expansion history from supernovae: Cosmology versus systematics". United Kingdom. doi:10.1093/mnras/stz589.
@article{osti_1499212,
title = {Model independent expansion history from supernovae: Cosmology versus systematics},
author = {L’Huillier, Benjamin and Shafieloo, Arman and Linder, Eric V. and Kim, Alex G.},
abstractNote = {We examine the Pantheon supernovae distance data compilation in a model independent analysis to test the validity of cosmic history reconstructions beyond the concordance $\Lambda$CDM cosmology. Strong deviations are allowed by the data at $z\gtrsim1$ in the reconstructed Hubble parameter, $Om$ diagnostic, and dark energy equation of state. We explore three interpretations: 1) possibility of the true cosmology being far from $\Lambda$CDM, 2) supernovae property evolution, and 3) survey selection effects. The strong (and theoretically problematic) deviations at $z\gtrsim1$ vanish and good consistency with $\Lambda$CDM is found with a simple Malmquist-like linear correction. The adjusted data is robust against the model independent iterative smoothing reconstruction. However, we caution that while by eye the original deviation from $\Lambda$CDM is striking, $\chi^2$ tests do not show the extra linear correction parameter is statistically significant, and a model-independent Gaussian Process regression does not find significant evidence for the need for correction at high-redshifts.},
doi = {10.1093/mnras/stz589},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 485,
place = {United Kingdom},
year = {2019},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1093/mnras/stz589

Citation Metrics:
Cited by: 9 works
Citation information provided by
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    Works referencing / citing this record:

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    Stress testing the dark energy equation of state imprint on supernova data
    journal, June 2019


    Measuring the Distances to Quasars at High Redshifts with Strong Lensing
    journal, September 2019