Solution to the cosmological constant problem by gauge theory of gravity

Based on geometry picture of gravitational gauge theory, the cosmological constant is determined theoretically. The cosmological constant is related to the average energy density of gravitational gauge field. Because the energy density of gravitational gauge field is negative, the cosmological constant is positive, which generates repulsive force on stars to make the expansion rate of the Universe accelerated. A rough estimation of it gives out its magnitude of the order. of about 10(-52)m(-2), which is well consistent with experimental results.