Scale Dependence of Dark Energy Antigravity
We investigate the effects of negative pressure induced by dark energy (cosmological constant or quintessence) on the dynamics at various astrophysical scales. Negative pressure induces a repulsive term (antigravity) in Newton’s law which dominates on large scales. Assuming a value of the cosmological constant consistent with the recent SnIa data we determine the critical scaler R c beyond which antigravity dominates the dynamics (r c ∼ 1Mpc) and discuss some of the dynamical effects implied. We show that dynamically induced mass estimates on the scale of the Local Group and beyond are significantly modified due to negative pressure. We also briefly discuss possible dynamical tests (eg effects on local Hubble flow) that can be applied on relatively small scales (a few Mpc) to determine the density and equation of state of dark energy.
KeywordsCosmological Constant Newton’s law Dark Energy Galactic Dynamics Hubble Flow
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