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After a short summary of our bimetric model of the Universe, an exactnonlinear solution is built, which demonstrates the existence of solutions forour two coupled field equations system. In addition to the classical positivegravitational lensing, this solution is shown to also lead to negativegravitational lensing, a phenomenon previously described in 1995 (Astrophysicsand Space Science). Such negative lensing provides an alternativeinterpretation for the observed faint magnitudes of high redshift galaxies, sofar considered as dwarf galaxies.

Bigravity : A bimetric model of the Universe. Positive and negative gravitational lensings