FIRST-YEAR SLOAN DIGITAL SKY SURVEY-II (SDSS-II) SUPERNOVA RESULTS: CONSTRAINTS ON NONSTANDARD COSMOLOGICAL MODELS

By J. Sollerman, E. Mörtsell, T. Davis, M. Blomqvist, Bruce A. Bassett, A. Becker, D. Cinabro, A. Filippenko, R. Foley, Joshua A. Frieman and 11 more. 2009

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We use the new Type Ia supernovae discovered by the Sloan Digital Sky Survey-II supernova survey, together with additional supernova data sets as well as observations of the cosmic microwave background and baryon acoustic oscillations to constrain cosmological models. This complements the standard cosmology analysis presented by Kessler et al. in that we discuss and rank a number of the most popular nonstandard cosmology scenarios. When this combined data set is analyzed using the MLCS2k2 light-curve fitter, we find that more exotic models for cosmic acceleration provide a better fit to the data than the ΛCDM model. For example, the flat Dvali–Gabadadze–Porrati model is ranked higher by our information-criteria (IC) tests than the standard model with a flat universe and a cosmological constant. When the supernova data set is instead analyzed using the SALT-II light-curve fitter, the standard cosmological-constant model fares best. This investigation of how sensitive cosmological model selection is to assumptions about, and within, the light-curve fitters thereby highlights the need for an improved understanding of these unresolved systematic effects. Our investigation also includes inhomogeneous Lemaître–Tolman–Bondi (LTB) models. While our LTB models can be made to fit the supernova data as well as any other model, the extra parameters they require are not supported by our IC analysis. Finally, we explore more model-independent ways to investigate the cosmic expansion based on this new data set.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/1c4bca13cff8da2f2d1fe8232fb7e9a9c02bc50d

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Citations in the corpus

The Data Release of the Sloan Digital Sky Survey-II Supernova Survey (2014, background): “…environment, and SN type (Dilday et al. 2008, 2010a,b; Smith et al. 2012; Taylor et al. 2014), and have lead to important new constraints on cosmology with detailed studies of systematic uncertainties (Kessler et al. 2009a; Sollerman et al. 2009; Lampeitl et al. 2010a; Betoule et al. 2014).”
Early-time light curves of Type Ib/c supernovae from the SDSS-II Supernova Survey (2014, methodology): “Results based on the first season of SN Ia data were presented in Kessler et al. (2009); Sollerman et al. (2009); Lampeitl et al. (2010), while Betoule et al. (2014) make use of the intermediate redshift (0.05< z <0.4) SN Ia data collected during all the three SDSS-II seasons.”
The WiggleZ Dark Energy Survey: joint measurements of the expansion and growth history at z < 1 (2012, background): “Firstly, the expansion history H(z) is not directly measured by supernovae but must be determined as a derivative of the noisy luminosity distances (Wang & Tegmark 2005, Sollerman et al. 2009, Shafieloo & Clarkson 2010).”
THE EFFECT OF HOST GALAXIES ON TYPE Ia SUPERNOVAE IN THE SDSS-II SUPERNOVA SURVEY (2010, unknown): “The first year (2005) of the SDSS-II SN sample was recently used for detailed cosmological analyses (Kessler et al. 2009a; Sollerman et al. 2009; Lampeitl et al. 2010).”
The WiggleZ Dark Energy Survey: measuring the cosmic expansion history using the Alcock-Paczynski test and distant supernovae (2011, methodology): “When the supernovae data are subject to model-independent non-parametric analysis, the evidence for accelerating expansion is much weaker (Wang & Tegmark 2005, Shapiro & Turner 2006, Shafieloo 2007, Sollerman et al. 2009, Shafieloo & Clarkson 2010).”
Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples (2014, methodology): “Intermediate redshifts (0.05 < z < 0.4) were targeted by the SDSS-II supernovae survey (Frieman et al. 2008; Kessler et al. 2009a; Sollerman et al. 2009; Lampeitl et al. 2010a; Campbell et al. 2013).”
Does the Hubble constant tension call for new physics? (2018, methodology): “In combination with CMB observations, BAO data can be used to either infer cosmological parameters independently of rs and h [48, 49], or to break the degeneracy of h as inferred from CMB observations with, e.”
The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: Constraining modified gravity (2016, unknown): “…Ia observations by Betoule et al. (2014), a compilation of 740 SN Ia from the SDSS-II supernovae survey (Frieman et al. 2008; Kessler et al. 2009; Sollerman et al. 2009; Lampeitl et al. 2009; Campbell et al. 2013) as well as the Supernova Legacy Survey (SNLS, Astier et al. 2006; Sullivan et al.…”
FIRST-YEAR SLOAN DIGITAL SKY SURVEY-II SUPERNOVA RESULTS: HUBBLE DIAGRAM AND COSMOLOGICAL PARAMETERS (2009, methodology): “For constraints on time-varying w, see Sollerman et al. (2009).”