Nonlinear long-wavelength solutions are constructed for cosmological perturbations in non-adiabatic multi-fluid systems, admitting adiabatic and entropy modes at leading order via ADM and gradient expansion.
(2.47) and (2.49) gives (0)ρ(α)(t, xk) =c ′ (α)(xk) a(t)ψ2(t, xk) −3Γ(α) ,(3.64) wherec ′ (α)(xk) are integral function which comes from energy equation
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Cosmological long-wavelength solutions in non-adiabatic multi-fluid systems
Nonlinear long-wavelength solutions are constructed for cosmological perturbations in non-adiabatic multi-fluid systems, admitting adiabatic and entropy modes at leading order via ADM and gradient expansion.