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[CMB]Some questions about power spectrum

Subject: [CMB]Some questions about power spectrum
From: "pihou"
Date: 12 Mar 2006 01:01:57 -0800
Newsgroups: sci.astro
I've started CMB study recently. Power spectrum is very important
concept, but why we usually use k^3P(k) instead of P to represent the
power spectrum? And how does the power-law come from? Especially, why
is the scale-invariant spectrum(Harrison-Zel'dovich spectrum) so
important and useful?
Any suggestions? Some books or papers should I read to resolve my

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