In the paper, http://arxiv.org/pdf/1205.3365v1.pdf, page 21, the author argues that if:(adsbygoogle = window.adsbygoogle || []).push({});

t →∞(1-iϵ), all the terms in equation (193) goes to zero, except the first term.

Can anyone explain this to me?

Thanks

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# Question on Cosmological Constant paper

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