Mass density vs. energy density at cosmological scales
Copyright policy )Mass density vs. energy density at cosmological scales
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.
11 pages, 4 figures; matches the published version in Physics Letters B
- Center for Advanced Systems Understanding Germany
- Istanbul Technical University Turkey
- North Carolina Central University United States
- Odessa I. I. Mechnikov National University Ukraine
- Helmholtz-Zentrum Dresden-Rossendorf Germany
cosmological perturbations, cosmic screening, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Physics, QC1-999, \(N\)-body simulations, FOS: Physical sciences, Equations of motion in general relativity and gravitational theory, General Relativity and Quantum Cosmology (gr-qc), power spectrum, large-scale structure, General Relativity and Quantum Cosmology, Large-scale structure, Power spectrum, Astrophysical cosmology, inhomogeneous universe, inhomogeneous Universe, N-body simulations, Inhomogeneous Universe, Cosmic screening, Galactic and stellar dynamics, Cosmological perturbations, Relativistic cosmology, Astrophysics - Cosmology and Nongalactic Astrophysics
cosmological perturbations, cosmic screening, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Physics, QC1-999, \(N\)-body simulations, FOS: Physical sciences, Equations of motion in general relativity and gravitational theory, General Relativity and Quantum Cosmology (gr-qc), power spectrum, large-scale structure, General Relativity and Quantum Cosmology, Large-scale structure, Power spectrum, Astrophysical cosmology, inhomogeneous universe, inhomogeneous Universe, N-body simulations, Inhomogeneous Universe, Cosmic screening, Galactic and stellar dynamics, Cosmological perturbations, Relativistic cosmology, Astrophysics - Cosmology and Nongalactic Astrophysics
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