Space-time is not a backdrop or an inert stage on which the drama of evolution unfolds. In spite of its awe-inspiring elegance and depth, however, general relativity is incomplete because it ignores quantum mechanics. There are current attempts at unifying the two theories, with emphasis on the quantum nature of geometry. This work has already resolved some outstanding problems of theoretical physics and provides a new paradigm in which matter, radiation, and geometry are all on the some footing and can be converted in to one another via physical processes. Einstein s vision on the physical nature of space-time geometry is now elevated to the quantum mechanical level.
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