« Cosmologie/Les perturbations cosmologiques » : différence entre les versions

: <math>a \frac{\partial \delta}{\partial t} = \nabla \cdot u</math>

 

 

: <math>\frac{\partial}{\partial t} \left( a \frac{\partial \delta}{\partial t} \right) + H \left( a \frac{\partial \delta}{\partial t} \right) = \frac{1}{a} \left( \frac{\Delta P}{\rho_m} + \Delta \Phi \right)</math>