Dark matter in ghost-free bigravity theory: From a galaxy scale to the universe

Abstract

We study the origin of dark matter based on the ghost-free bigravity theory with twin matter fluids. The present cosmic acceleration can be explained by the existence of graviton mass, while dark matter is required in several cosmological situations [the galactic missing mass, the cosmic structure formation and the standard big-bang scenario (the cosmological nucleosynthesis vs the CMB observation)]. Assuming that the Compton wavelength of the massive graviton is shorter than a galactic scale, we show the bigravity theory can explain dark matter by twin matter fluid as well as the cosmic acceleration by tuning appropriate coupling constants.

15 pages, 7 figures, minor changes, references added

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• Mass eigenstates in bimetric theory with matter coupling
• Cosmological gravitational particle production of massive spin-2 particles
• Stability and Anti-evaporation of the Schwarzschild-de Sitter Black Holes in Bigravity
• Surfing gravitational waves: can bigravity survive growing tensor modes?
• A general theory of linear cosmological perturbations: bimetric theories
• GR-GSG Hybrid Gravity
• The bimetric model with an informational metric tensor