Why does this integral go to zero? Where alpha+ is a creation operator?(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\int \frac{d^3k}{w_k} k^j \left(\alpha^+ (\underline{k}) \alpha^+ (-\underline{k})e^{2iw_k x^0}\right)[/tex]

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# Why does this integral go to zero?

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