There exists a new coupling effect between cosmic expansion and gravity. With this new gravitational coupling, we can simply explain the phenomenon of accelerated expansion of the universe. The calculation results are in full agreement with the cosmological measurements. This proves that the new gravitational coupling is the dark energy. Dark energy does not exist. This theoretical model brings about a new coupling constant for the coupling effect. The value of this coupling constant can be measured by measuring the cosmic redshift at the inflection point of the expansion speed of the universe.

cosmology, Planck Gravity Theory, Friedmann equation, cosmic expansion, accelerated expansion, dark energy, gravity coupling, coupling constant, Hubble constant, cosmic redshift, inflection point, inflection radius, cosmic mass, gravitational acceleration