= David H. Lyth
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<David H. Lyth> helped establish when large-scale cosmological curvature is conserved. With <David Wands>, <Karim A. Malik> and <Andrew R. Liddle>, he showed that negligible <non-adiabatic pressure perturbations> preserve the <uniform-density curvature perturbation> when spatial-gradient effects are negligible.<A new approach to the evolution of cosmological perturbations on large scales by David Wands and others>[Abstract and sections II–III: conservation derived from local energy conservation]{ref}
The result specifies when primordial fluctuations can be carried forward without solving every intervening gravitational detail.
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