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The Friedmann–Lemaître–Robertson–Walker metric is a solution to the Einstein equations in General Relativity. The FRW universe is a solution that represents an expanding universe with a time-dependent…
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propagator gives the probability amplitude for a particle to travel from one place to another in a given time, or to travel with a certain energy and momentum.
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the study of optical fibers, which are thin pieces of high quality optical materials which are able to act as a waveguide for some frequencies of light. This waveguide or 'light pipe'…
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