Duel of cosmological screening lengths

Abstract

Two distinct perturbative approaches have been recently formulated within General Relativity, arguing for the screening of gravity in the $\Lambda$CDM Universe. In this paper we compare them and show that the offered screening concepts, each characterized by its own interaction range, can peacefully coexist. Accordingly, we advance a united scheme, determining the gravitational potential at all scales, including regions of nonlinear density contrasts, by means of a simple Helmholtz equation with the effective cosmological screening length. In addition, we claim that cosmic structures may not grow at distances above this Yukawa range and confront its current value with dimensions of the largest known objects in the Universe.

arXiv comment17 pages, one nice figure

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• Is the Observable Universe Consistent with the Cosmological Principle?
• Screening vs. gevolution: in chase of a perfect cosmological simulation code
• Yukawa vs. Newton: gravitational forces in a cubic cosmological simulation box
• Gravitational Interaction in the Chimney Lattice Universe
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