Regular Article – Theoretical Physics
Scalar and vector perturbations in a universe with nonlinear perfect fluid
Department of Physics, Istanbul Technical University, Maslak, 34469, Istanbul, Turkey
2 Kapteyn Astronomical Institute, University of Groningen, P.O. Box 800, 9700, AV Groningen, The Netherlands
3 Department of Mathematics and Physics, North Carolina Central University, 1801 Fayetteville St, 27707, Durham, NC, USA
4 Astronomical Observatory, Odessa I.I. Mechnikov National University, Dvoryanskaya St. 2, 65082, Odessa, Ukraine
Accepted: 5 March 2021
Published online: 21 March 2021
We study a three-component universe filled with dust-like matter in the form of discrete inhomogeneities (e.g., galaxies) and perfect fluids characterized by linear and nonlinear equations of state. Within the cosmic screening approach, we develop the theory of scalar and vector perturbations. None of the energy density contrasts associated with the distinct components is treated as small. Consequently, the derived equations are valid at both sub- and super-horizon scales and enable simulations for a variety of cosmological models.
© The Author(s) 2021
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