2005/06/03 by Xiang-Song Chen, Chen, Xiang-Song
Computer Science · Physics and Astronomy · #Astrophysics (astro-ph) #Computational Physics and Python Applications #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0506070
3 pages, no figure; discussions added that low-energy gravitons can also serve as both dark matter and dark energy; references added
openalex publication_date 2005/06/03 · arxiv created 2005/06/07 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Massive gravity with second and fourth derivatives is shown to give both attractive and repulsive gravities. In contrast to the attractive gravity correlated with the energy-momentum tensor, the repulsive gravity is related to a fixed mass mx, which equals a spin-dependent factor fσ times the graviton mass. Therefore, particles with energy below mx are both dark matter and dark energy: Their overall gravity is attractive with normal matter but repulsive among themselves. Detailed analyses reveal that this unified dark scenario can properly account for the observed dark matter/energy phenomena: galaxy rotation curves, transition from early cosmic deceleration to recent acceleration; and naturally overcome other dark scenarios' difficulties: the substructure and cuspy core problems, the difference of dark halo distributions in galaxies and clusters, and the cosmic coincidence. Very interestingly, Dirac particles have fσ=1/√ 2, all bosonic matter particles have fσ=0, and the only exceptional boson is the graviton itself, which may have fσ>1.