Canonical gauge-invariant variables for scalar perturbations in synchronous coordinates
Zdzislaw A. Golda, Andrzej Woszczyna, Karolina Zawada
Abstract
Under an appropriate change of the perturbation variable Lifshitz-Khalatnikov propagation equations for the scalar perturbation reduce to d'Alembert equation. The change of variables is based on the Darboux transform.
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