Mass density vs. energy density at cosmological scales

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 $\Lambda$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

References in corpus (7)

• Large-Scale Structure of the Universe and Cosmological Perturbation Theory
• What galaxy surveys really measure
• General relativity and cosmic structure formation
• Isolating relativistic effects in large-scale structure
• First-order Cosmological Perturbations Engendered by Point-like Masses
• Duel of cosmological screening lengths
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Cited by in corpus (1)

• Suppression of matter density growth at scales exceeding the cosmic screening length