# Fully nonlinear cosmological perturbations of multi-component fluid and field systems

@article{Hwang2015FullyNC, title={Fully nonlinear cosmological perturbations of multi-component fluid and field systems}, author={Jai-chan Hwang and Hyerim Noh and Chan-Gyung Park}, journal={arXiv: General Relativity and Quantum Cosmology}, year={2015} }

We present fully nonlinear and exact cosmological perturbation equations in the presence of multiple components of fluids and minimally coupled scalar fields. We ignore the tensor-type perturbation. The equations are presented without taking the temporal gauge condition in the Friedmann background with general curvature and the cosmological constant. For each fluid component we ignore the anisotropic stress. The multiple component nature, however, introduces the anisotropic stress in the…

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