Abstract Details

Name: Haveesh Singirikonda
Affiliation: Indian Institute of Technology Hyderabad, 502285
Conference ID: ASI2021_200
Title : Model comparison of LambdaCDM vs Rh=ct using cosmic chronometers
Authors and Co-Authors : Haveesh Singirikonda (Department of Physics, Indian Institute of Technology Hyderabad), Shantanu Desai (Department of Physics, Indian Institute of Technology Hyderabad)
Abstract Type : Poster
Abstract Category : General Relativity and Cosmology
Abstract : In 2012, Bilicki and Seikel (Mon Not R Astron Soc 425:1664, 2012) showed that H(z) data reconstructed using Gaussian Process Regression from cosmic chronometers and baryon acoustic oscillations, conclusively rules out the R_h=ct model. These results were disputed by Melia and collaborators in two different works (Melia and Maier in Mon Not R Astron Soc 432:2669, 2013; Melia and Yennapureddy in JCAP 2018:034, 2018), who showed using both an unbinned analysis and Gaussian Process reconstructed H(z) data from chronometers, that R_h=ct is favored over LambdaCDM model. To resolve this imbroglio, we carry out model comparison of LambdaCDM versus R_h=ct by independently reproducing the above claims using the latest chronometer data. We perform model selection between these two models using Bayesian model comparison. We find that no one model between LambdaCDM and R_h=ct is decisively favored when uniform priors on LambdaCDM parameters are used. However, if we use priors centered around the Planck best-fit values, then LambdaCDM is very strongly preferred over R_h=ct.