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A bimetric description of the universe is proposed, which explains cosmicacceleration deduced from optically observed high-redshift objects. Thisphenomenon is classically charged to a mysterious repulsive "dark energy" whosetrue nature is unknown. This is identified in this model with a set ofparticles having negative mass and energy. These negative mass particles,emitting negative energy photons, are not observable using optical instruments.

Bigravity as an interpretation of the cosmic acceleration