TY - JOUR
T1 - Dark matter in ghost-free bigravity theory
T2 - From a galaxy scale to the universe
AU - Aoki, Katsuki
AU - Maeda, Kei Ichi
N1 - Publisher Copyright:
© 2014 American Physical Society.
PY - 2014/12/30
Y1 - 2014/12/30
N2 - 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 cosmic microwave background 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.
AB - 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 cosmic microwave background 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.
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U2 - 10.1103/PhysRevD.90.124089
DO - 10.1103/PhysRevD.90.124089
M3 - Article
AN - SCOPUS:84920180567
SN - 1550-7998
VL - 90
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 12
M1 - 124089
ER -