510 Mathematics 530 Physics Cosmology The First Friedmann Equation By jackkiperman On November 19, 2022 If a is the scale factor – the current distance between any two points in space- then the rate of change of that scale factor in relation to the size of the universe is given as : Where is derived from a sphere; is the gravitational constant; is the energy density; is the cosmological constant; is the curvature parameter; and, is the speed of light. #Equation