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| In this paper some speculated ideas are invented by analogy between gravity and electromagnetism. Analog to the relation between the fine structure constant and the Planck constant, planck constant of gravitational interaction is defined by the rest mass of the electron and the reduced fine structure constant. Then a recommended value of planck constant of gravitational interaction is given. If the definition is true, the reduced fine structure constant may be a common constant shared by gravitational and electromagnetic interactions. Based on the planck constant of gravitational interaction, main spectrum lines of Lyman series, Balmer series, and Paschen series of gravitational radiation of atomic Hydrogen are discussed, respectively. All the above ideas originate from a simple viewpoint that gravitational masses (the gravitational charges) should be invariant under Lorentz transformations. |
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| Keywords:Theoretical Physics; fine structure constant; gravitational interaction; Planck constant; Maxwell's equations |
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