Charge (physics)
Physics property associated with symmetries / From Wikipedia, the free encyclopedia
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This article is about charge in the most general physics sense. For charge as relates to electrical phenomena, see electric charge. For other uses of charge, see Charge.
In physics, a charge is any of many different quantities, such as the electric charge in electromagnetism or the color charge in quantum chromodynamics. Charges correspond to the time-invariant generators of a symmetry group, and specifically, to the generators that commute with the Hamiltonian. Charges are often denoted by , and so the invariance of the charge corresponds to the vanishing commutator , where is the Hamiltonian. Thus, charges are associated with conserved quantum numbers; these are the eigenvalues of the generator .
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