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.
(3.3) is satisfied at an equality timet0 = ˜teq(xk) in two fluid systems, the condition is expressed as (0)ρ(α)(˜teq(xk), xk) = (b)ρ(α)(˜teq(xk) + ∆t(xk)),(4.40) forα= 1,2
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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.