Square-root parametrization of dark energy in f(Q)cosmology  

作　　者：M Koussour N Myrzakulov Alnadhief H A Alfedeel E I Hassan D Sofuoğlu Safa M Mirgani 

机构地区：[1]Quantum Physics and Magnetism Team,LPMC,Faculty of Science Ben M'sik,Casablanca Hassan II University [2]L.N.Gumilyov Eurasian National University [3]Ratbay Myrzakulov Eurasian International Centre for Theoretical Physics [4]Department of Mathematics and Statistics,Imam Mohammad Ibn Saud Islamic University(IMSIU) [5]Department of Physics,Faculty of Science,University of Khartoum [6]Centre for Space Research,North-West University [7]Department of Physics,Istanbul University Vezneciler 34134

出　　处：《Communications in Theoretical Physics》2023年第12期105-114,共10页理论物理通讯（英文版）

基　　金：supported and funded by the Deanship of Scientific Research at Imam Mohammad Ibn Saud Islamic University(IMSIU)(Grant No.IMSIU-RG23008).

摘　　要：This paper is a parametrization of the equation of state(Eo S)parameter of dark energy(DE),which is parameterized using square-root(SR)form i.e.ω_(SR)=ω_(0)+ω_(1)z/√z^(2)+1,where ω_(0)and ω_(1) are free constants.This parametrization is examined in the context of the recently suggested f(Q)gravity theory as an alternative to general relativity(GR),in which gravitational effects are attributed to the non-metricity scalar Q with the functional form f(Q)=Q+αQ^(n),whereαand n are arbitrary constants.We derive observational constraints on model parameters using the Hubble dataset with 31 data points and the Supernovae(SNe)dataset from the Pantheon samples compilation dataset with 1048 data points.For the current model,the evolution of the deceleration parameter,density parameter,EoS for DE,and Om(z)diagnostic have all been investigated.It has been shown that the deceleration parameter favors the current accelerated expansion phase.It has also been shown that the EoS parameter for DE has a quintessence nature at this time.

关 键 词：COSMOLOGY dark energy f(Q)gravity EoS parameter 

分 类 号：P145.9[天文地球—天体物理]