Since in some sense the interaction picture can be thought of
as rotating with the system ket
only that part of the electromagnetic wave that approximately co-rotates is kept;
the counter-rotating component is discarded.
— Wikipedia on Rotational Wave Approximation
2009.12.01 Tuesday ACHK
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An institution is the lengthened shadow of one man; as, Monachism, of the Hermit Antony; the Reformation, of Luther; Quakerism, of Fox; Methodism, of Wesley; Abolition, of Clarkson. Scipio, Milton called “the height of Rome”; and all history resolves itself very easily into the biography of a few stout and earnest persons.
— Ralph Waldo Emerson
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2009.12.01 Tuesday
Physics Town 