Local probes strongly favor $\Lambda$CDM against power-law and $R_h=ct$ universe

Abstract

We constrain three cosmological models, i.e. the concordance cold dark matter plus a cosmological constant ($\Lambda$CDM) model, Power-law (PL) model, and $R_h=ct$ model using the available local probes, which includes the JLA compilation of type-Ia supernovae (SNe Ia), the direct measurement of Hubble constant (H(z)), and the baryon acoustic oscillations (BAO). For $\Lambda$CDM model, we consider two different cases, i.e. zero and non-zero spatial curvature. We find that by using the JLA alone, it is indistinguishable between $\Lambda$CDM and PL models, but the $R_h=ct$ model is strongly disfavored. If we combine JLA+H(z), the $\Lambda$CDM model is strongly favored against the other two models. The combination of all the three datasets also supports $\Lambda$CDM as the best model. We also use the low-redshift ($z<0.2$) data to constrain the deceleration parameter using cosmography method, and find that only the $\Lambda$CDM model is consistent with cosmography. However, there is no strong evidence to distinguish between flat and non-flat $\Lambda$CDM models by using the local data alone.

8 pages, 3 tables

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• An improved model-independent assessment of the late-time cosmic expansion
• Cosmological test using the Hubble diagram of high-z quasars
• Model-independent cosmic acceleration and type Ia supernovae intrinsic luminosity redshift dependence
• Model Comparison of $\Lambda$CDM vs $R_h=ct$ using Cosmic Chronometers
• Evidence for cosmic acceleration with next-generation surveys: A model-independent approach
• Reference level of the vacuum energy density of the Universe and astrophysical data
• A comparison of the R_h=ct and LCDM cosmologies based on the observed halo mass function
• Comparison of $\Lambda$CDM and $R_h=ct$ with updated galaxy cluster $f_{gas}$ measurements using Bayesian inference