Duel of cosmological screening lengths


Canay E. , Eingorn M.

PHYSICS OF THE DARK UNIVERSE, vol.29, 2020 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 29
  • Publication Date: 2020
  • Doi Number: 10.1016/j.dark.2020.100565
  • Title of Journal : PHYSICS OF THE DARK UNIVERSE

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. (C) 2020 Elsevier B.V. All rights reserved.