In the face of this situation, human has proposed a variety of new theories of gravity. By now, humans have not solved the problem of gravitational quantization. The problem of gravitation becomes more and more complicated and difficult. But, human find that, between General Relativity and Quantum Mechanics, there are contradictions, and gravity cannot be quantized. In the 20th century, human find the quantum phenomena, and proposed the Quantum Mechanics, and proposed the Quantum Field Theory. General relativity is more perfect than Newton gravity theory. The General Relativity theory can explain these phenomena. In the early 20th century, Einstein proposed the Special Relativity, and further proposed General Relativity. Newton gravitation can't explain deflection of light and precession of mercury. Since Newton proposed the theory of gravitation, the study of gravitation has become more and more deeply. The new gravitation can derive out the result of the Planck Energy. The new gravity perhaps is a force that inhibits the uncertainty of macroscopic objects. In gravity field, the scale factor determines the quantization results of particle’s motion. The new gravity has obvious scale effect. In the new gravitation, there not exists black hole, but exists empty hole, and not exists space-time singularity and energy singularity. In the new gravitation, the photon’s equivalent gravitational acceleration is twice of the acceleration in Newton Gravitation. The new gravitation is simpler than the General Relativity. In the new gravitation, the energy is conserved. The space-time is flat in the new gravitation, not is curved. This difference can be a experimental test to distinguish which one is more realistic. But even under approximate weak gravity condition, if the orbit is not approximate circular, if the orbit has higher eccentricity, there exists obvious difference between the General Relativity and the new gravitation. The four classic experimental tests, the deflection of light by the sun, the precession of mercury, the red shift of light by the sun, the radar echo delay, are experimental tests to the new gravitation also. Under approximate weak gravity and approximate circular orbit condition, the new gravitation is equivalent to the General Relativity. The gravitational mass is only equivalent to the rest mass. But any particle can be affected by gravity. The particle can’t be the gravity source if the particle not has rest mass. In the new gravitation, the gravity source is only the rest mass, not energy. In the new gravitation, there only have inertial coordinates, not have non-inertial coordinates. In the new gravitation, there does not have gravitational acceleration. Equivalence principle is invalid in the new gravitation. In 5-dimensional space-time, there not have gravity. Gravity only exists in 4-dimensional space-time. The new gravity can be seen as some kind of symmetry. The new gravity is an extension to Lorentz symmetry. The gravity is an additional projection force of Lorentz symmetry. The Lorentz symmetry is a projection of particle-wave symmetry from 5-dimensional space-time into 4-dimensional space-time. Gravity is a projection force from 5-dimensional space-time into 4-dimensional space-time.
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