The Quantum Theory of Fields, Steven Weinberg, P.120(adsbygoogle = window.adsbygoogle || []).push({});

above 3.3.24, it says,

If the matrix elements of W between H0 - eigenstates are sufficiently smooth functions of energy, then matrix elements of W(t) between smooth super-positions of energy eigenstates vanish for t→±∞

I can't get this. Could anyone please show this explicitly?

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# A question about <The Quantum Theory of Fields> P.120

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