= Cosmological Newtonian potential
{title2=$g_{00}=-a^2(1+2\Phi)$}
= Newtonian potential in cosmology
{c}
{synonym}
The potential $\Phi$ describes the lapse perturbation in <conformal Newtonian gauge>. The spatial curvature perturbation is conventionally denoted $\Psi$; the two are equal when the linear scalar anisotropic stress vanishes. On scales where the Newtonian limit applies, $\Phi$ agrees with the peculiar gravitational potential. Its Fourier-mode variance and the power spectrum of a comoving curvature perturbation are different observables.
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