Dynamical system analysis of Dirac-Born-Infeld scalar field cosmology in coincident f(Q)gravity  

作　　者：Sayantan Ghosh Raja Solanki P.K.Sahoo 

机构地区：[1]Department of Mathematics,Birla Institute of Technology and Science-Pilani,Hyderabad Campus,Hyderabad-500078,India

出　　处：《Chinese Physics C》2024年第9期199-209,共11页中国物理C（英文版）

基　　金：the Council of Scientific and Industrial Research(CSIR),Government of India,New Delhi,for a junior research fellowship(09/1026(13105)/2022-EMR-I);the University Grants Commission(UGC),New Delhi,India,for awarding a Senior Research Fellowship(UGC-Ref.No.:191620096030);the Science and Engineering Research Board,Department of Science and Technology,Government of India,for the financial support to carry out the research project(CRG/2022/001847)。

摘　　要：In this article,we present a dynamical system analysis of a Dirac-Born-Infeld scalar field in a modified f(Q)gravity context.We considered a polynomial form of modified gravity,used two different types of scalar potential,polynomial and exponential,and found a closed autonomous dynamical system of equations.We analyzed the fixed points of such a system and evaluated the conditions under which deceleration to late-time acceleration occurs in this model.We note the similarity of the two models and show that our result is consistent with a previous study on Einstein s gravity.We also investigated the phenomenological implications of our models by plotting EoS(ω),energy density(Ω),and deceleration parameter(q)w.r.t.to e-fold time and comparing to the present value.We conclude the paper by observing how the dynamical system analysis differs in the modified f(Q)gravity,and present the future scope of our research.

关 键 词：Dirac-Born-Infeld field f(Q)gravity dark energy dynamical system analysis 

分 类 号：P159[天文地球—天文学]