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:
-
[1];
[2];
- Korea Astronomy and Space Science Institute, Yuseong-gu, Daedeok-daero 776, Daejeon 34055, Korea
- 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
- 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
- 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. https://doi.org/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. https://doi.org/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}
}
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https://doi.org/10.1093/mnras/stz589
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Works referencing / citing this record:
Model-independent cosmic acceleration and redshift-dependent intrinsic luminosity in type-Ia supernovae
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