Duel of cosmological screening lengths
  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.
