Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-04-06
Mod.Phys.Lett. A15 (2000) 1541-1550
Astronomy and Astrophysics
Astrophysics
5 two column pages, 2 figures
Scientific paper
10.1142/S0217732300002048
Newton's law gets modified in the presence of a cosmological constant by a small repulsive term (antigarvity) that is proportional to the distance. Assuming a value of the cosmological constant consistent with the recent SnIa data ($\Lambda \simeq 10^{-52} m^{-2}$) we investigate the significance of this term on various astrophysical scales. We find that on galactic scales or smaller (less than a few tens of kpc) the dynamical effects of the vacuum energy are negligible by several orders of magnitude. On scales of 1Mpc or larger however we find that vacuum energy can significantly affect the dynamics. For example we show that the velocity data in the Local Group of galaxies correspond to galactic masses increased by 35% in the presence of vacuum energy. The effect is even more important on larger low density systems like clusters of galaxies or superclusters.
Axenides Minos
Floratos E. G.
Perivolaropoulos Leandros
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