1. Mass density vs. energy density at cosmological scales
- Author
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Maxim Eingorn, Ezgi Yilmaz, A. Emrah Yükselci, and Alexander Zhuk
- Subjects
N-body simulations ,Large-scale structure ,Inhomogeneous Universe ,Cosmological perturbations ,Power spectrum ,Cosmic screening ,Physics ,QC1-999 - Abstract
In the presence of the gravitational field, the energy density of matter no longer coincides with its mass density. A discrepancy exists, of course, also between the associated power spectra. Within the Λ CDM model, we derive a formula that relates the power spectrum of the energy density to that of the mass density and test it with the help of N-body simulations run in comoving boxes of 2.816 Gpc/h. The results confirm the validity of the derived formula and simultaneously show that the power spectra diverge significantly from one another at large cosmological scales.
- Published
- 2024
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