= Frozen contribution to a de Sitter scalar spectrum
{title2=$P_{\rm frozen}=H^2/(2k^3),\quad\Delta^2_{\rm frozen}=H^2/(4\pi^2)$}
= Frozen scalar power
{synonym}
The second term in the <equal-time two-point function of a de Sitter scalar> is independent of time for constant $H$. It dominates on <superhorizon scales> and has constant dimensionless <power spectrum>, giving a <scale-invariant inflationary power spectrum>. The <infrared qualification of a scale-invariant covariance> still applies to the formally infinite-volume coincident variance.
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