(adsbygoogle = window.adsbygoogle || []).push({}); What is the "equation for the amplitude of scalar perturbations"?

I am studying inflation now, and in a book I read "equation for the amplitude of scalar perturbations", in the paper the author does not explain what is it, could any one give some detail on this equation or any reference? Thanks a lot in advance.

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# What is the equation for the amplitude of scalar perturbations ?

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