Co-existence of Gravity and Antigravity: The Unification of Dark Matter and Dark Energy
| dc.creator | Chen, Xiang-Song | |
| dc.date | 2005-06-03 | |
| dc.date | 2005-06-07 | |
| dc.date.accessioned | 2026-07-07T02:17:54Z | |
| dc.date.available | 2026-07-07T02:17:54Z | |
| dc.description | 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 $m_x$, which equals a spin-dependent factor $f_σ$ times the graviton mass. Therefore, particles with energy below $m_x$ 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 $f_σ=1/\sqrt 2$, all bosonic matter particles have $f_σ=0$, and the only exceptional boson is the graviton itself, which may have $f_σ>1$. | |
| dc.description | 3 pages, no figure; discussions added that low-energy gravitons can also serve as both dark matter and dark energy; references added | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0506070 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0506070 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/9288 | |
| dc.subject | Astrophysics | |
| dc.title | Co-existence of Gravity and Antigravity: The Unification of Dark Matter and Dark Energy | |
| dc.type | text |