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## Main Question or Discussion Point

The slope of the primordial power spectrum (the power spectrum of density fluctuations produced by inflation in the very early Universe before it had been modified by gravitational/hydro dynamics) is often written,

P(k) = A * k

and then in the same line referred to as scale invariant or the Harrison-Zeldovich scale invariant spectrum. How is this scale invariant when it is a function of the wave number k? Anyone know this?

P(k) = A * k

and then in the same line referred to as scale invariant or the Harrison-Zeldovich scale invariant spectrum. How is this scale invariant when it is a function of the wave number k? Anyone know this?