Testing Nonstandard Cosmological Models With Snls3 Supernova Data and Other Cosmological Probes

Abstract

We investigate the implications for some nonstandard cosmological models using data from the first three years of the Supernova Legacy Survey (SNLS3), assuming a spatially flat universe. A comparison between the constraints from the SNLS3 and those from other SN Ia samples, such as the ESSENCE, Union2, SDSS-II and Constitution samples, is given and the effects of different light-curve fitters are considered. We find that SN Ia with SALT2 or SALT or SIFTO can give consistent results and the tensions between different data sets and different lightcurve fitters are obvious for fewer-free-parameters models. At the same time, we also study the constraints from the SNLS3 along with data from the cosmic microwave background and the baryonic acoustic oscillations (CMB/BAO), and the latest Hubble parameter versus redshift (H(z)). Using model selection criteria such as χ 2 /dof, GoF, AIC and BIC, we find that, among all the cosmological models considered here (ΛCDM, constant w, varying w, DGP, modified polytropic Cardassian, and the generalized Chaplygin gas), the flat DGP is favored by the SNLS3 alone. However, when additional CMB/BAO or H(z) constraints are included, this is no longer the case, and the flat ΛCDM becomes preferred.

The Cardassian expansion revisited: constraints from updated Hubble parameter measurements and type Ia supernova data

“…All our bounds are similar within the 1σ C.L. to those obtained by other authors, e.g Li et al (2012). combining SN Ia, BAO and CMB data measure n = 0.014 +0.36 −0.94 , l = 1.09 +1.01 −0.46 , Magaña et al (2015) using strong lensing features estimate n = 0.41±0.25, l = 5.2 ± 2.25, Zhai et al (2017a) provide n = 0.16 +0.08 0.09 , l = 1.38 +0.25 −0.22 from the joint analysis of CMB, BAO plus SN Ia (JLA) data, and Zhai et al (2017b) give n = 0.02 +0.26 −0.41 , l = 1.1 +0.8 −0.4 from the joint analysis of CMB, BAO, SN Ia, f σ8 and the H0 value from…”

“…The Cardassian models are extensively studied in the literature. They have been tested with several cosmological observations (see for example Wang et al 2003;Wei et al 2015;Liang et al 2011;Feng & Li 2010;Xu 2012;Li et al 2012, and references therein). Wei et al (2015) put constraints on the OC model parameters using a joint analysis of gamma ray burst data and Type Ia supernovae (SN Ia) of the Union 2.1 sample (Suzuki et al 2012).…”

Testing and selecting cosmological models with ultra-compact radio quasars

“…However, it is important to note that the shape of the constraint contours derived in our analysis are very similar to those shown in Refs. [65][66][67][68][69]. Moreover, the results obtained with standard rulers turned out to correspond well with previous work.…”

Model-independent Estimations for the Cosmic Curvature from the Latest Strong Gravitational Lensing Systems

“…Recently, Scolnic et al (2018) released a new dataset called Pantheon SNe Ia, which consists of 1048 SNe Ia in the redshift range 0.01 < z < 2.3. As the previously mentioned JLA SNe Ia, the nuisance parameters η and ν are usually regarded as free parameters and are constrained together with cosmological parameters (Li et al 2011(Li et al , 2012. However, this method might result in cosmological model dependence, therefore the distance calibrated in a specific cosmological model should not be directly used for other cosmological implications.…”