How different connections in flat FLRW geometry impact energy conditions in $f(Q)$ theory?

Abstract

In this study of the modified $f(Q)$ theory of gravity in the spatially flat Friedmann-Lemaître-Robertson-Walker (FLRW) spacetime, we explore all the affine connections compatible with the symmetric teleparallel structure; three classes of such connections exist, each involving an unknown time-varying parameter ${\hat{I}}^3(t)$. Assuming ordinary barotropic fluid as the matter source, we first derive the Friedmann-like pressure and energy equations. Next we impose constraints on the parameters of two separate $f(Q)$ models, $f(Q)=Q+{\hat{I}}^2{Q}^2$ and $f(Q)=Q+{\hat{I}}^2\sqrt{-Q}$ from the traditional energy conditions. Observational values of some prominent cosmological parameters are used for this purpose, yielding an effective equation of state $\ddot{I}{‰}^{eff}=-0.82$.

To be published in the journal "Fortschritte der Physik"