We are so accustomed to Newtonian law of gravitation, which actually works very well up to Mpc distances, that the news of this law being NOT universal may seem astonishing. However, it has been recently strictly proven that a physical quantity in GR/cosmology, which may be associated with the gravitational potential, demonstrates Yukawa behavior starting from Gpc scales. In short, the universal gravitation at arbitrary distances should be described by Yukawa law.
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