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EINSTEIN'S THEORY OF SPACETIME AND GRAVITY

2001
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Mathematics and the 21st Century
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In a time-independent gravitational field, Emmy Noether's theorem implies that light moves upward with constant energy. The gravitational red shift is therefore to be understood as resulting from a reduction of the energy states of the emitting source. Applied to the annihilation of para-positronium, in which the entire rest mass of the positronium system is converted into gamma rays, this understanding of the red shift proves the rest masses are reduced in a gravitational field. Going back to

doi:10.1142/9789812810243_0005
fatcat:qbmj7qmbwne7he6ew7x2wljsbi