Homework Statement I must find the following equation of motion: φ'' + 3Hφ' + dV/dφ = 0 Using the scalar field Lagrangian: (replace the -1/2m^2φ^2 term with a generic V(φ) term though) with the Euler-Lagrange Equation I know that I must assume φ = φ(t) and the scale factor a = a(t) Homework Equations The Attempt at a Solution