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

Chinese Physics C 2024年第9期48卷 199-209页

作者： sayantan ghosh Raja Solanki P.K.Sahoo Department of Mathematics Birla Institute of Technology and Science-PilaniHyderabad CampusHyderabad-500078India

In this article,we present a dynamical system analysis of a Dirac-Born-Infeld scalar field in a modified f(Q)gravity *** 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 *** analyzed the fixed points of such a system and evaluated the conditions under which deceleration to late-time acceleration occurs in this *** note the similarity of the two models and show that our result is consistent with a previous study on Einstein s *** also investigated the phenomenological implications of our models by plotting EoS(ω),energy density(Ω),and deceleration parameter(q)*** e-fold time and comparing to the present *** 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

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Non-exotic static spherically symmetric thin-shell wormhole solution in f(Q,T)gravity

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Chinese Physics C 2023年第7期47卷 173-189页

作者： Moreshwar Tayde sayantan ghosh P.K.Sahoo Department of Mathematics Birla Institute of Technology and Science-PilaniHyderabad CampusHyderabad-500078India

In this study,we conduct an analysis of traversable wormhole solutions within the framework of linear f(Q,T)=αQ+βT gravity,ensuring that all energy conditions hold for the entire *** solutions presented in this paper are derived through a comprehensive analytical examination of the parameter space associated with the wormhole *** involves considering the exponents governing the redshift and shape functions,as well as the radius of the wormhole throat(r_(0)),the redshift function value at the throat(∅_(0)),and the model parameters(αandβ).Moreover,we establish bounds on these free parameters,which guarantee the satisfaction of the energy conditions throughout spacetime and also provide two ***,we use the Israel junction condition to observe the stability of a thin-shell around the ***,we calculate the null energy condition criteria as well as the potential for the thin-shell and how it varies with the chosen shape function.

关键词： wormhole energy conditions f(Q,T)gravity junction condition thin-shell

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