Polytropic gas cosmology and late-time acceleration  

作　　者：Safae Dahmani Himanshu Chaudhary Amine Bouali Shibesh Kumar Jas Pacif Taoufik Ouali 

机构地区：[1]Laboratory of Physics of Matter and Radiation,Mohammed I University,BP 717,Oujda,Morocco [2]Department of Applied Mathematics,Delhi Technological University,Delhi 110042,India [3]Pacif Institute of Cosmology and Selfology(PICS),Sagara,Sambalpur 768224,Odisha,India [4]Department of Mathematics,Shyamlal College,University of Delhi,Delhi-110032,India [5]Higher School of Education and Training,Mohammed I University,BP 717,Oujda,Morocco

出　　处：《Chinese Physics C》2024年第11期220-230,共11页中国物理C（英文版）

摘　　要：The accelerated expansion of the Universe has sparked significant interest in the mysterious concept of dark energy within cosmology.Various theories have been proposed to explain dark energy,and many models have been developed to understand its origins and properties.This research explores cosmic expansion using the Polytropic Gas(PG)approach,which combines Dark Matter(DM)and Dark Energy(DE)into a single mysterious fluid.We used the principles of general relativity and built our model within the homogeneous and isotropic framework of Friedmann-Lemaître-Robertson-Walker(FLRW)spacetime.We revised the Original Polytropic Gas(OPG)model to expand its applicability beyond the OPG,to theΛCDM model.Our model's parameters were carefully adjusted to reflect key cosmological features of the variable PG approach.To validate our model,we performed a Markov chain Monte Carlo analysis using recent Supernova data from the Pantheon+survey,36 observational data points,162 Gamma-Ray Bursts,and 24 binned Quasars distance modulus data.The AIC and BIC criteria indicate that our model is slightly preferred over theΛCDM model based on observational data.We also tested our model with data,Supernova,Gamma-Ray Bursts,and Quasars and found that it exhibits a transition from a quintessential to phantom regime.The Polytropic dark fluid model(PDFM)is a promising candidate that effectively addresses the interplay between cosmic acceleration and dark energy.

关 键 词：polytropic dark energy PARAMETRIZATION 

分 类 号：P159[天文地球—天文学]