Constrain the Jerk Parameters with DESI 2024 Data  

作　　者：Jia-Wei Wu Kun-Yuan Hong 

机构地区：[1]School of Physics and Astronomy,Sun Yat-sen University,Zhuhai 519082,China [2]Department of Physics and Astronomy,University College London,Gower Street,London,WC1E 6BT,UK

出　　处：《Research in Astronomy and Astrophysics》2024年第12期175-182,共8页天文和天体物理学研究(英文版)

基　　金：supported by the National SKA Program of China No. 2020SKA0110402;the National Natural Science Foundation of China (NSFC) general program (grant No. 12073088);the National Key R&D Program of China (grant No. 2020YFC2201600);Guangdong Basic and Applied Basic Research Foundation (grant No. 2024A1515012573)。

摘　　要：The deceleration coefficient q and the jerk coefficient j obtained by the Taylor expansion of the scale factor a(t)play an important role in the study of cosmology.The current value of these coefficients for a cosmological model reflects the transition time between the phases dominated by dark energy and matter and can be used to determine if and how much the universe is decelerating.Thus,these coefficient values offer a way of constraining a particular cosmology model.Research based on this scenario was completed by Orlando Luongo and Marco Muccino.However,some approaches in this method should be tested prudently because some conditions such as dd_(L)/d_(Z)>0 dH/d_(Z) and may not be guaranteed.In this study,we used the MAPAge model to reconstruct the jerk parameters (q0and j0) with DESI 2024 data.Using the MAPAge model ensures particular physical circumstances are satisfied in the approach of determining the jerk parameters.Compared to the previous method,which used the Taylor expansion series q0,j0,and s0as model-independent parameters,we obtained more physical and slightly different results for the jerk parameters.Our results suggest that the DESI 2024 BAO data set favours different jerk parameters compared to the jerk parameters in the standardΛCDM model.

关 键 词：(cosmology) dark energy-(cosmology) large-scale structure of universe-(cosmology )cosmological parameters 

分 类 号：P159[天文地球—天文学]