# A New approach to the evolution of cosmological perturbations on large scales

@article{Wands2000ANA, title={A New approach to the evolution of cosmological perturbations on large scales}, author={David Wands and Karim A. Malik and David H. Lyth and Andrew R. Liddle}, journal={Physical Review D}, year={2000}, volume={62}, pages={043527} }

We discuss the evolution of linear perturbations about a Friedmann-Robertson-Walker background metric, using only the local conservation of energy-momentum. We show that on sufficiently large scales the curvature perturbation on spatial hypersurfaces of uniform-density is conserved when the non-adiabatic pressure perturbation is negligible. This is the first time that this result has been demonstrated independently of the gravitational field equations. A physical picture of long-wavelength…

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