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Joined 2026-09-21 Message
Incoming links: David H. Lyth
David H. Lyth 2026-11-05
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.[ref]
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
The result specifies when primordial fluctuations can be carried forward without solving every intervening gravitational detail.
Karim A. Malik 2026-11-05
Karim A. Malik developed the treatment of gauge-invariant cosmological curvature with David Wands, David H. Lyth and Andrew R. Liddle. Their 2000 analysis derived large-scale evolution from stress-energy conservation, exposing how a non-adiabatic pressure perturbation can change the uniform-density curvature perturbation.[ref]
A new approach to the evolution of cosmological perturbations on large scales by David Wands and others. Sections II–V: pressure source and generalized adiabatic perturbations