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Observational signature of sign of cosmological perturbation

Posted: April 20 2015
by Kevin J Ludwick
Hello,

As far as I know, all observational evidence for cosmological perturbations comes from the CMB power spectrum, which goes like [tex]\delta^2[/tex]. Are there any observational signatures that would indicate the sign of [tex]\delta[/tex]?

Thanks for any help,
Kevin