The density of states (DOS) is a concept used in various fields of physics, particularly in solid-state physics, statistical mechanics, and quantum mechanics. It describes the number of quantum states available to a system at a given energy level and is crucial for understanding the distribution of particles in various energy states.
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The density of states is defined so that counts one-particle states with energies in an interval of width . A sum over closely spaced states then becomes an integral weighted by .