Cosmology in symmetric teleparallel gravity and its dynamical system

Understand

We explore an extension of the symmetric teleparallel gravity denoted the $f(Q)$ theory, by considering a function of the nonmetricity invariant $Q$ as the gravitational Lagrangian.

• Some interesting properties could be found in the $f(Q)$ theory by comparing with the $f(R)$ and $f(T)$ theories.
• The field equations are derived in the $f(Q)$ theory.
• The cosmological application is investigated.