Cosmological constrains on fast transition Unified Dark Matter models

Spanish Relativity Meeting: almost 100 years after Einstein's revolution

Lazkoz, Ruth^1 ; Leanizbarrutia, Iker^1 ; Salzano, Vincenzo^2

Department of Theoretical Physics, University of the Basque Country UPV/EHU, P.O. Box 644, Bilbao

48080, Spain^1

Institute of Physics, University of Szczecin, Wielkopolska 15, Sczcecin

70-451, Poland^2

关键词: Bayes factor;    Bayesian inference;    Dark matter;    Fast transition;    Galaxy clustering;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/600/1/012028/pdf
DOI  :  10.1088/1742-6596/600/1/012028

来源: IOP

【 摘 要 】

In this work we show the results obtained applying a Unified Dark Matter (UDM) model with a fast transition to a set of cosmological data. Two different functions to model the transition are tested, and the feasibility of both models is explored using CMB shift data from Planck [1], Galaxy Clustering data from [2] and [3], and Union2.1 SNe Ia[4]. These new models are also statistically compared with the ACDM and quiessencemodels using Bayes factor through evidence. Bayesian inference does not discard the UDM models in favor of λCDM.