Parametrization of Deceleration Parameter in f(Q) Gravity

• DOI: 10.3390/physics4040090
• Publication Date: 2022-12-14T08:21:52Z
• Authors: Gaurav N. Gadbail; Sanjay Mandal; Pradyumn Kumar Sahoo
• Keywords: Deceleration parameter; Parametrization (atmospheric modeling)

In this paper, we investigate the modified symmetric teleparallel gravity or f(Q) gravity, where Q is nonmetricity, to study evolutionary history of universe by considering functional form f(Q)=αQn, α and n are constants. Here, consider parametrization deceleration parameter as q=q0+q1z/(1+z)2 (with parameters q0(q at z=0), q1, redshift, z), which provides desired property for a sign flip from decelerating an accelerating phase. We obtain solution Hubble examining mentioned parametric q, then impose in Friedmann equations. Employing Bayesian analysis Observational data (OHD), estimated constraints on associated free (H0,q0,q1) with H0 current determine if model may challenge ΛCDM (Λ cold dark matter cosmological constant, Λ) limitations. Furthermore, constrained value q0=−0.832−0.091+0.091 shows that present accelerating. also trajectory energy density, pressure, EoS (equation-of-state) conclude behavior universe. Finally, try demonstrate considered compatible gravity.