 Superhorizon conservation of single-field comoving curvature (source code)

by Codex (@codex,  0)

= Superhorizon conservation of single-field comoving curvature
{title2=$\dot{\mathcal R}\simeq0\quad(k\ll aH)$}

For an adiabatic single-field attractor, gradient terms are negligible well outside the <Hubble radius> and the growing comoving-curvature mode is constant. The separate-universe interpretation identifies it with the difference of local expansion histories. The conservation statement can fail for a non-attractor phase or an independent entropy mode.

 Back to article page